Outgoing SMTP Server Settings: Complete A–Z List, Setup Guide & Troubleshooting

If you’ve ever tried to send an email only to watch it sit stubbornly in your outbox, you’re not alone. Outgoing email problems are incredibly common, and they almost always trace back to one thing: the SMTP settings in your device. SMTP is the system your email app uses to hand off messages to the internet, and if even one setting is wrong — the server name, the port, the password, the encryption — nothing goes through.

This guide explains everything in plain English. You’ll learn what an SMTP server is, how to find your correct settings, how to configure email on any device, and how to fix the most common errors. You’ll also get a giant A–Z list of outgoing mail servers, plus clear guidance on security, deliverability, and alternatives to unreliable ISP SMTP servers. If you want your email to send smoothly without guesswork, you’re in the right place.

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Section 1: Introduction — What an Outgoing SMTP Server Actually Does

Email feels instant, but every message you send is handed off, processed, routed, authenticated, and delivered through a surprisingly complex network of servers. At the center of that process sits one essential piece of technology: the SMTP server, also known as your outgoing mail server.

SMTP stands for Simple Mail Transfer Protocol, the system that handles the sending side of email. Whenever you click “Send” on your laptop, phone, or email app, your device doesn’t beam your message straight to the recipient. Instead, it hands the email off to an SMTP server, which acts as a secure delivery hub. That server authenticates who you are, ensures the message meets security requirements, determines the correct destination, and passes it along its delivery path.

If the SMTP settings in your device are wrong — the wrong server name, wrong port, wrong password, or wrong encryption — your emails simply won’t leave your outbox. That’s why knowing your correct outgoing SMTP settings is essential whether you’re setting up a new device, switching email apps, managing a custom domain, or troubleshooting send failures.

This guide walks you through everything you need to know about outgoing mail servers, from a basic explanation of how SMTP works to the complete A–Z directory of common SMTP servers used by major providers and internet service companies. You’ll also learn how to find your own SMTP settings (even if your provider isn’t listed), how to configure the most popular email apps, and how to troubleshoot send errors that stop your messages from going through.

Whether you’re a beginner trying to get email working on your phone or a more experienced user managing domains, hosting, or multiple inboxes, this mega-guide gives you a complete, evergreen reference to keep your email sending reliably.

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Section 2: Quick Start — The Outgoing Mail Settings Most People Need

For a large percentage of users, the right SMTP settings follow a very predictable pattern. Before diving into the details, here’s the quick-answer section many of you probably came here for.

Typical SMTP Settings

Setting	Value
Protocol	SMTP (Simple Mail Transfer Protocol)
Outgoing mail server (SMTP)	smtp.providername.com (varies by provider)
Port (with TLS)	587
Port (with SSL)	465
Port (non-secure/legacy)	25 (often blocked; not recommended)
Encryption	TLS or SSL (required by most providers)
Authentication	Required (use full email address + password)

If you’re unsure what to use, port 587 with TLS is the modern standard and works for most major email services.

Quick Checks Before You Start

• Make sure you know your full email address and password.
• Confirm whether your provider requires an app-specific password (common with Gmail, iCloud, and Microsoft accounts that use two-factor authentication).
• Know whether your email is hosted by an ISP, a domain host, or a third-party service (Gmail, Yahoo, Outlook.com, etc.).
• If you’re using a custom domain (yourname@yourdomain.com), check your hosting control panel (e.g., cPanel, Plesk, or your provider’s dashboard).

If everything in this section matches your setup, you can skip ahead to the setup instructions or the full SMTP server directory. If not, keep going — the next section explains exactly how SMTP works and why the correct settings matter.

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Section 3: How SMTP Works (A Clear, Non-Technical Deep Dive)

Most people never think about what happens after they click “Send.” Understanding the basics of SMTP helps you troubleshoot issues more quickly and choose the right settings for your device.

What SMTP Actually Does

SMTP is the protocol responsible for one job: sending email from your device to the rest of the internet. It doesn’t store, retrieve, or display messages. That’s what IMAP and POP are for. SMTP simply pushes outbound mail to its destination.

Here’s the simplified flow:

1. Your email client (Outlook, Apple Mail, phone app) connects to your SMTP server.
   It uses a hostname like smtp.gmail.com or smtp.yourdomain.com.
2. The server authenticates you.
   This verifies you’re allowed to send email from your account.
   • Uses your full email address + password
   • May require an app-specific password
   • Often requires TLS or SSL encryption
3. Your message is accepted, packaged, and queued for delivery.
   The SMTP server checks formatting, spam likelihood, and sender identity.
4. The server looks up the recipient’s domain.
   It finds the destination mail server using DNS and MX records.
5. The message is transmitted to the recipient’s mail server.
   From there, the receiving server stores it until the recipient accesses it.

To you, this all feels instant, but there’s a surprising number of steps happening behind the scenes.

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Why SMTP Settings Matter So Much

Incorrect SMTP configuration causes immediate and predictable problems:

• Emails not sending
• Messages stuck in Outbox
• “Cannot connect to SMTP server” errors
• Authentication failures
• Encryption mismatch errors
• “Server rejected your login” messages
• The app can receive mail, but not send it

When something goes wrong on the outgoing side, SMTP is almost always the root.

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A Quick Distinction: SMTP vs IMAP vs POP

It’s easy to mix these up.

Protocol	Purpose	Good to Know
SMTP	Sends email	Outgoing only
IMAP	Syncs email across devices	Most modern accounts use IMAP
POP	Downloads email to one device	Outdated for most users

If you can receive email but not send, your IMAP/POP settings are fine — the problem is your SMTP configuration.

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Why Port Numbers Matter

SMTP relies on specific ports to communicate. The main three are:

• 587 (TLS) – Most recommended; modern standard
• 465 (SSL) – Secure; required by some providers
• 25 (No encryption) – Legacy; often blocked by ISPs

If you use the wrong port, your message may fail before it even leaves your device.

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How Encryption Fits In

Modern email providers require encrypted connections to prevent:

• Password theft
• Message interception
• Unauthorized account access
• Spam and spoofing attacks

This is why you’ll often see:

• SSL
• TLS
• STARTTLS

Each refers to a secure method for establishing a protected connection between your device and the SMTP server.

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Why Is Authentication Required?

In the early days of email, some servers let anyone send messages through them, which quickly turned them into spam machines. Today, nearly all providers require proper authentication:

• Your email address
• Your account password
• Sometimes an app-specific password
• Sometimes, OAuth permissions (Gmail, Outlook, iCloud)

If this authentication fails, SMTP immediately shuts you out.

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When an SMTP Server Passes the Message to Another Server

Your SMTP server doesn’t send your email directly to the recipient’s inbox. It hands it off to the recipient’s mail server, which stores it until the user checks their mail.

Think of SMTP like your local post office:

• You drop off a letter
• They accept, inspect, and sort it
• It may go through multiple hubs
• Eventually, it reaches the right mailbox

Understanding this helps you troubleshoot delivery issues later (e.g., blacklisting, blocked IPs, forwarding failures).

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Section 4: How to Find Your SMTP Settings (Even If Your Provider Isn’t Listed)

Even with a massive A–Z directory, there will always be email providers, custom domains, and regional services that aren’t on the list. Fortunately, finding your correct outgoing SMTP settings is easy once you know where to look.

This section gives you multiple reliable ways to identify or confirm your SMTP settings — even for rare hosts, private servers, or older ISP accounts.

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4.1 Check Your Provider’s Official Support Page

This is the most accurate, up-to-date source. Search using:

• “SMTP settings + your provider”
• “Outgoing mail server + provider name”
• “Email setup + provider name + port”

Examples:

• “Cox SMTP settings”
• “iCloud Mail outgoing server”
• “Bluehost SMTP port”
• “AT&T email setup”

Nearly all providers maintain a public documentation page with:

• SMTP server hostname
• Port numbers
• Encryption requirements
• Username/password rules
• App-specific password instructions
• Device-specific setup guides

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4.2 Look in Your Email App’s Existing Account Settings

If you already have the email working on another device or app, you can copy the settings from there.

Check These Areas:

• Account settings
• Outgoing server
• SMTP settings
• Server name / hostname
• Port
• Security type (SSL/TLS)
• Requires authentication

You may find:

• smtp.mail.provider.com
• mail.provider.net
• smtp.yourdomain.com

This is often the fastest method since the working settings are already confirmed.

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4.3 If You’re Using a Custom Domain: Check Your Hosting Control Panel

Custom domains (example: name@yourdomain.com) typically use SMTP servers provided by your web host or cPanel/Plesk environment.

In cPanel:

• Go to Email Accounts
• Find your email address
• Click Connect Devices or Set Up Mail Client

This page displays:

• Incoming IMAP/POP settings
• Outgoing SMTP settings
• Secure vs. insecure ports
• Configuration scripts for Outlook/Apple Mail

In Plesk:

• Go to Mail
• Choose your email address
• Look for Mail Settings or Manual Configuration

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4.4 Use Auto-Configuration Tools (If Your Provider Has Them)

Some services provide auto-setup tools:

• Apple Configuration Profiles
• Outlook auto-discovery scripts
• Thunderbird auto-config
• Hosting provider scripts

These automatically fill in the SMTP settings for you and are extremely reliable.

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4.5 Check Welcome Emails from Your Provider

Hosting companies, ISPs, and email providers often send a welcome email containing:

• Server names
• Ports
• Username format
• Recommended security settings

Search your inbox for terms like:

• “email setup”
• “SMTP”
• “mail configuration”
• “IMAP/POP instructions”

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4.6 Test Your Domain’s Configuration Using Online Tools

If you’re using a custom domain, DNS tools can help:

• MX record lookup
• Autodiscover checks
• Hostname pattern recognition

Some tools even suggest the expected SMTP server based on your domain’s MX records.

If your domain’s MX record is:

mx1.yourhost.com

Your SMTP server is often:

smtp.yourhost.com

or:

mail.yourdomain.com

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4.7 Contact Support (Still a Valid Option)

If you hit a wall, your provider’s support team can give you the exact SMTP details in seconds — especially for uncommon regional ISPs or companies with multiple legacy email domains.

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4.8 When All Else Fails: Try the “Common Patterns” Method

Most providers use predictable naming conventions:

Try these defaults:

• smtp.[provider].com
• smtp.[provider].net
• mail.[provider].com
• mail.[yourdomain].com
• smtp.[yourdomain].com
• smtp-mail.[provider].com

Use these ports:

• 587 (TLS) – best default
• 465 (SSL) – alternative secure port
• 25 – legacy, often blocked

This method works surprisingly often for smaller hosting companies.

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4.9 Special Note for Gmail, Outlook.com, and iCloud Users

These providers may require:

• OAuth authorization (no password entry)
• App-specific passwords (2FA enabled)
• Unique SMTP hostnames

If authentication fails, always check whether your provider uses extra security layers.

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Section 5: A–Z SMTP Server Listings

Here is an alphabetized list of all the providers we’ve tracked down over the years, along with their corresponding SMTP settings. Don’t see yours? Let me know in the comments.

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A

AOL Mail

• SMTP Server: smtp.aol.com
• Ports: 587 (TLS), 465 (SSL)
• Authentication: Yes

AT&T / Bellsouth / SBCGlobal

• SMTP Server: smtp.mail.att.net
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes
• Notes: Secure mail key may be required.

Apple iCloud Mail

• SMTP Server: smtp.mail.me.com
• Ports: 587 (TLS), 465 (SSL)
• Authentication: Yes

Aruba.it

• SMTP Server: smtp.aruba.it
• Ports: 587 (TLS), 465 (SSL)
• Authentication: Yes

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B

Bluehost

• SMTP Server: mail.yourdomain.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

Bell Canada / Sympatico.ca

• SMTP Server: smtp.bellnet.ca
• Ports: 587 (TLS)
• Authentication: Yes

BT Internet (UK)

• SMTP Server: mail.btinternet.com
• Ports: 587 (TLS)
• Authentication: Yes

BellSouth

• Notes: Uses AT&T SMTP settings.

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C

CenturyLink

• SMTP Server: smtp.centurylink.net
• Ports: 587 (TLS)
• Authentication: Yes

Charter / Spectrum

• SMTP Server: smtp.charter.net
• Ports: 587 (TLS)
• Authentication: Yes

Comcast / Xfinity

• SMTP Server: smtp.comcast.net
• Ports: 587 (TLS), 465 (SSL)
• Authentication: Yes

Cox Email

• SMTP Server: smtp.cox.net
• Ports: 587 (TLS)
• Authentication: Yes

Cricket / Aio Wireless

• SMTP Server: smtp.mycricket.com
• Ports: 25 (legacy), 587
• Authentication: Sometimes
• Notes: Service may be deprecated.

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D

DreamHost

• SMTP Server: mail.yourdomain.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

Domain.com

• SMTP Server: smtp.domain.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

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E

EarthLink

• SMTP Server: smtpauth.earthlink.net
• Ports: 587 (TLS)
• Authentication: Yes

Entel (Latin America)

• SMTP Server: smtp.entel.net.pe (varies by region)
• Ports: 25, 587
• Authentication: Often required

Exchange (Microsoft 365 / Hosted Exchange)

• SMTP Server: smtp.office365.com
• Ports: 587 (TLS)
• Authentication: Yes

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F

Frontier

• SMTP Server: smtp.frontier.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

FastMail

• SMTP Server: smtp.fastmail.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

FairPoint (Consolidated Communications)

• SMTP Server: smtp.consolidated.net
• Ports: 587
• Authentication: Yes

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G

Gmail / Google Mail

• SMTP Server: smtp.gmail.com
• Ports: 587 (TLS), 465 (SSL)
• Authentication: Yes
• Notes: App-specific password required if 2FA is enabled.

GoDaddy (Workspace Email)

• SMTP Server: smtpout.secureserver.net
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

GMX (GMX.com / GMX.net)

• SMTP Server: mail.gmx.com (US), mail.gmx.net (EU)
• Ports: 587 (TLS), 465 (SSL)
• Authentication: Yes

Gradient Net

• SMTP Server: smtp.gradient.net
• Ports: 25, 587
• Authentication: Often required

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H

Hotmail / Outlook.com / Live.com

• SMTP Server: smtp-mail.outlook.com
• Ports: 587 (TLS)
• Authentication: Yes

HostGator

• SMTP Server: mail.yourdomain.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

Hover

• SMTP Server: mail.hover.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

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I

iCloud Mail

• SMTP Server: smtp.mail.me.com
• Ports: 587 (TLS), 465 (SSL)
• Authentication: Yes

IONOS (1&1)

• SMTP Server: smtp.ionos.com
• Ports: 587 (TLS), 465 (SSL)
• Authentication: Yes

InMotion Hosting

• SMTP Server: mail.yourdomain.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

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J

Juno

• SMTP Server: smtp.juno.com
• Ports: 587
• Authentication: Required

NetZero

• SMTP Server: smtp.netzero.net
• Ports: 587
• Authentication: Required

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K

KPN (Netherlands)

• SMTP Server: smtp.kpnmail.nl
• Ports: 587 (TLS)
• Authentication: Yes

KCOM (UK)

• SMTP Server: mail.kcomhome.com
• Ports: 587
• Authentication: Yes

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L

Lycos Mail

• SMTP Server: smtp.mail.lycos.com
• Ports: 587
• Authentication: Yes

Libero.it (Italy)

• SMTP Server: smtp.libero.it
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

LaPoste.net (France)

• SMTP Server: smtp.laposte.net
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

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M

Mail.com

• SMTP Server: smtp.mail.com
• Ports: 587 (TLS), 465 (SSL)
• Authentication: Yes

Microsoft 365 / Office 365

• SMTP Server: smtp.office365.com
• Ports: 587 (TLS)
• Authentication: Yes

Mediacom

• SMTP Server: smtp.mediacomtoday.net
• Ports: 587
• Authentication: Yes

Megapath

• SMTP Server: smtp.megapath.net
• Ports: 25, 587
• Authentication: Often required

Mailfence

• SMTP Server: smtp.mailfence.com
• Ports: 587 (TLS)
• Authentication: Yes

Mail.ru

• SMTP Server: smtp.mail.ru
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

Midco

• SMTP Server: smtp.midco.net
• Ports: 587
• Authentication: Yes

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N

Namecheap Private Email

• SMTP Server: mail.privateemail.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

Network Solutions

• SMTP Server: smtp.mail.mailplatform.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

NetZero

• SMTP Server: smtp.netzero.net
• Ports: 587
• Authentication: Yes
• Notes: (Included under J as well.)

NTLWorld / Virgin Media

• SMTP Server: smtp.virginmedia.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

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O

Office 365 / Microsoft 365

• SMTP Server: smtp.office365.com
• Ports: 587 (TLS)
• Authentication: Yes

Optimum Online / Optimum.net

• SMTP Server: mail.optimum.net
• Ports: 587 (TLS)
• Authentication: Yes

Orange (France)

• SMTP Server: smtp.orange.fr
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

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P

PacBell / SBC / AT&T Legacy

• SMTP Server: smtp.mail.att.net
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

PeoplePC

• SMTP Server: smtpauth.peoplepc.com
• Ports: 587
• Authentication: Required

PLDT (Philippines)

• SMTP Server: smtp.pldtvibe.com
• Ports: 587
• Authentication: Often required

PlusNet (UK)

• SMTP Server: relay.plus.net
• Ports: 587
• Authentication: Required when sending off-network

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Q

Q.com / CenturyLink Legacy

• SMTP Server: smtp.centurylink.net
• Ports: 587
• Authentication: Yes

Qmail / QmailHost

• SMTP Server: smtp.qmailhost.com
• Ports: 587 (TLS), 465 (SSL)
• Authentication: Yes

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R

Rackspace Email

• SMTP Server: smtp.rackspace.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

RoadRunner / TWC / Spectrum

• SMTP Server: mail.twc.com
• Ports: 587
• Authentication: Yes

Rogers (Canada)

• SMTP Server: smtp.broadband.rogers.com
• Ports: 587
• Authentication: Yes
• Notes: Some accounts route through Yahoo systems.

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S

Shaw (Canada)

• SMTP Server: mail.shaw.ca
• Ports: 587
• Authentication: Yes

SiteGround

• SMTP Server: mail.yourdomain.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

Spectrum

• SMTP Server: mail.brighthouse.com or mail.twc.com
• Ports: 587
• Authentication: Yes

SMTP.com

• SMTP Server: smtp.smtp.com
• Ports: 25, 587, 2525
• Authentication: Yes

Sonic.net

• SMTP Server: mail.sonic.net
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

Suddenlink

• SMTP Server: smtp.suddenlink.net
• Ports: 587
• Authentication: Yes

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T

Telus (Canada)

• SMTP Server: smtp.telus.net
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

Tiscali (UK/Italy)

• SMTP Server: smtp.tiscali.co.uk or smtp.tiscali.it
• Ports: 587
• Authentication: Yes

T-Online (Germany)

• SMTP Server: securesmtp.t-online.de
• Ports: 587 (TLS), 465 (SSL)
• Authentication: Yes

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U

UK2

• SMTP Server: smtp.uk2.net
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

USA.net

• SMTP Server: smtp.usa.net
• Ports: 587
• Authentication: Required

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V

Verizon (Legacy accounts via AOL/Yahoo)

• SMTP Server: smtp.aol.com
• Ports: 587 (TLS), 465 (SSL)
• Authentication: Yes

Virgin Media (UK)

• SMTP Server: smtp.virginmedia.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

Vodafone (varies by country)

• SMTP Server: smtp.vodafone.net (varies)
• Ports: 587
• Authentication: Often required

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W

Windstream

• SMTP Server: smtp.windstream.net
• Ports: 587
• Authentication: Yes

WOW! (WideOpenWest)

• SMTP Server: smtp.mail.wowway.com
• Ports: 587
• Authentication: Yes

Web.com

• SMTP Server: mail.yourdomain.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

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X

Xfinity / Comcast

• SMTP Server: smtp.comcast.net
• Ports: 587 (TLS), 465 (SSL)
• Authentication: Yes

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Y

Yahoo Mail / Ymail / Rocketmail

• SMTP Server: smtp.mail.yahoo.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes
• Notes: App password required if 2FA enabled.

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Z

Zoho Mail

• SMTP Server: smtp.zoho.com
• Ports: 465 (SSL), 587 (TLS)
• Authentication: Yes

Zimbra

• SMTP Server: mail.yourdomain.com (varies by host)
• Ports: 587 (TLS), 465 (SSL)
• Authentication: Yes

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6.1 How to Set Up SMTP in Microsoft Outlook (Desktop)

Outlook is one of the most widely used email clients, but it’s also particularly picky about SMTP settings. Here’s the step-by-step guide.

Step 1: Open Account Settings

• Go to File
• Choose Account Settings → Account Settings
• Select your email account
• Click Change

Step 2: Update Server Information

Under Server Settings:

• Outgoing mail server (SMTP):
  Enter your provider’s hostname (e.g., smtp.gmail.com, mail.yourdomain.com)

Step 3: Configure Port & Encryption

Click More Settings → Advanced:

Use these common configurations:

Encryption	Port
TLS	587
SSL	465
None (legacy)	25 (not recommended)

Step 4: Enable Authentication

Still in More Settings → Outgoing Server:

• Check My outgoing server (SMTP) requires authentication
• Select Use same settings as my incoming mail server

Step 5: Save & Test

Click:

• OK
• Next (Outlook runs a test)
• Finish

If Outlook hangs on “Testing,” it usually means:

• Wrong port
• Wrong encryption type
• App-specific password needed
• ISP blocking port 25

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6.2 How to Set Up SMTP on Apple Mail (macOS)

Step 1: Open Preferences

• Mail → Settings (or Preferences on older versions)
• Click Accounts

Step 2: Choose Your Account

Select the email address you want to update.

Step 3: Find Server Settings

Go to the Server Settings tab.

Step 4: Enter SMTP Details

Under Outgoing Mail Account (SMTP):

• SMTP server: your provider’s hostname
• User Name: full email address
• Password: account password or app-specific password

Step 5: Choose Ports & Encryption

• Port: 587 or 465
• Use TLS/SSL: enabled

Step 6: Save

Apple Mail may try to auto-detect settings. If it overwrites your entries incorrectly:

• Uncheck Automatically manage connection settings
• Re-enter the correct values manually.

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6.3 Gmail Web: Sending Email From Another Address (SMTP Required)

If you want Gmail to send from a custom domain (e.g., yourname@yourdomain.com):

Step 1: Go to Gmail Settings

• Gear icon → See all settings
• Click Accounts and Import

Step 2: Add Your Address

Under Send mail as, choose:

• Add another email address

Step 3: Enter SMTP Information

• SMTP Server: mail.yourdomain.com
• Port: 465 (SSL) or 587 (TLS)
• Username: full email address
• Password: email password

Gmail will send a verification code to the email you’re adding.

Important:

For security, Gmail may require:

• OAuth
• App-specific password
• Correct SPF/DKIM setup (for deliverability)

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6.4 iPhone / iPad (iOS Mail App)

Step 1: Open Settings

Go to:

• Settings → Mail → Accounts

Step 2: Choose Your Email Account

Tap your account → Account

Step 3: Go to SMTP Settings

Under Outgoing Mail Server, tap the SMTP entry (usually “Primary Server”).

Step 4: Enter Details

• Host Name: smtp.provider.com
• User Name: full email address
• Password: required
• Use SSL: enable (if using SSL/TLS)
• Port: 465 or 587

Step 5: Save

Tap Done.

If you get “Cannot Connect Using SSL,” try switching ports.

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6.5 Android Email Setup (General)

(Exact steps vary by manufacturer.)

Step 1: Open Email App Settings

• Choose your email account
• Tap Server Settings or Outgoing Server

Step 2: Configure SMTP

• SMTP server: varies by provider
• Security type: SSL/TLS
• Port: 465 or 587
• Authentication: required
• Enter username + password

Step 3: Save

Android immediately attempts to verify your settings.

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6.6 Mozilla Thunderbird

Step 1: Open Account Settings

• Three-line menu → Account Settings

Step 2: Find SMTP Settings

Scroll to the bottom → Outgoing Server (SMTP)

Step 3: Edit Your Server

• Description: optional
• Server Name: smtp.provider.com
• Port: 465 or 587
• Connection Security: SSL/TLS
• Authentication Method: Normal password
• User Name: full email address

Step 4: Assign SMTP Server to Account

In your account settings, select this server as the outgoing server.

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6.7 Windows Mail / Windows 10–11 Mail App

Step 1: Open Settings

• Settings → Manage Accounts
• Choose your email account

Step 2: Change Mailbox Sync Settings

Scroll to:

• Outgoing (SMTP) Email Server

Step 3: Enter SMTP Info

• SMTP hostname
• Requires authentication: Yes
• User name & password
• SSL: On
• Port: 587 or 465

Step 4: Save

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6.8 cPanel Email (for Custom Domains)

Most domain-based email uses cPanel.

Step 1: Log into cPanel

Go to:

• Email Accounts

Step 2: Find Your Address

Click Connect Devices.

Step 3: Use the Displayed Settings

cPanel provides:

• Secure SMTP: mail.yourdomain.com
• Port: 465 (SSL)
• Alternative port: 587 (TLS)
• Authentication: Yes

It also provides downloadable auto-configuration scripts for:

• Apple Mail
• Outlook
• Thunderbird

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6.9 Plesk Email

Step 1: Log in

Go to Mail → choose your address.

Step 2: Check Mail Settings

Find Manual setup details.

Step 3: Use the Standard Ports

Plesk uses:

• SMTP: mail.yourdomain.com
• Ports 465 or 587
• Authentication: required
• SSL/TLS: on

---

6.10 Hosting Providers (SiteGround, Bluehost, DreamHost, etc.)

Most hosting companies use the same pattern:

• SMTP Server: mail.yourdomain.com
• Ports: 465/587
• Authentication: Yes

The only differences tend to be:

• Whether SSL is required
• Whether you need an app-specific username/password
• Whether auto-config scripts are provided

---

7.1 Authentication Errors (The #1 Cause of SMTP Failure)

If your mail app says anything like:

• “Authentication failed”
• “The server rejected your login”
• “Username/password incorrect”
• “Cannot login to SMTP server”

It nearly always means one of these:

Fix 1: Double-check your username and password

Most providers require your full email address, not just the part before the @.

Fix 2: If you use two-factor authentication, you need an app-specific password

Applies to:

• Gmail
• iCloud
• Outlook.com
• Yahoo

If authentication keeps failing, this is the most likely culprit.

Fix 3: SMTP is using the wrong encryption method

If your provider requires TLS but you selected SSL (or vice versa), authentication usually fails.

Fix 4: Your account is locked or flagged

Some providers lock accounts after too many failed logins.

---

7.2 Wrong Port Number (SMTP Stalls or Won’t Connect)

Using the wrong port was historically the biggest cause of failure, and still causes problems today.

Modern, correct ports:

• 587 (TLS) — best default
• 465 (SSL) — common
• 25 — often blocked

If your app keeps “verifying” forever or times out, switch the port.

Fixes:

• Try port 587 first
• Try 465 next
• Avoid 25 unless your ISP specifically supports it (rare)

---

7.3 SSL/TLS Encryption Mismatch

If your encryption type doesn’t match your port, you’ll see errors like:

• “Cannot establish secure connection”
• “SSL handshake failed”
• “Server does not support encryption type”

Use these pairs:

Port	Encryption
587	TLS or STARTTLS
465	SSL
25	None or STARTTLS

Make sure your settings match the provider’s documentation.

---

7.4 Your ISP Is Blocking SMTP (Especially Port 25)

Many ISPs block SMTP traffic to prevent spam.

Symptoms:

• Mail won’t send
• Timeout errors
• SMTP server unreachable
• Works on mobile hotspot but not home WiFi

Fixes:

• Switch to 587
• Try 465
• Turn off VPN (some VPNs block outbound SMTP)
• Use your email provider’s authenticated SMTP instead of ISP SMTP

---

7.5 Incorrect SMTP Server Hostname

A tiny typo can cause big problems.

Check for:

• Missing letters
• Wrong domain (.net vs .com)
• “smtp” vs “mail” prefixes
• Extra spaces (common on mobile)

Example mistakes to look for:

• smpt.gmail.com
• smtp.gamil.com
• mail.gmal.com

Correcting the hostname often resolves instant failures.

---

7.6 The SMTP Server No Longer Exists (Common with ISPs)

Some providers have discontinued email support, merged systems, or forced users to webmail only.

Symptoms:

• Server ping fails
• Zero response from SMTP server
• “Could not connect”
• Provider website no longer lists SMTP settings

Fixes:

• Move to provider’s updated SMTP server
• Or switch to domain email + hosting
• Or use your email provider’s webmail SMTP support

This is especially common with old ISP addresses.

---

7.7 Your Email App Is Using the Wrong Password (Thanks to Cached Credentials)

Apps sometimes store old passwords even after you update them.

Fix:

Delete the account from the app and re-add it manually.
This refreshes cached SMTP credentials.

---

7.8 Firewall Blocking SMTP

Firewalls can block outbound SMTP traffic.

Check:

• Antivirus suites
• Windows firewall
• macOS firewall
• Router firewall
• Office networks with outbound restrictions

Fixes:

• Test sending email on a different network
• Temporarily disable firewall to see if it resolves the issue
• Add exception for mail app

---

7.9 SMTP Flags You as Suspicious or Spammy

If your outgoing mail fails with errors like:

• “Relaying denied”
• “Sender rejected”
• “Message refused due to policy”
• “550 5.7.1 unauthorized sender”

Your account or IP might be flagged.

Fixes:

• Use authenticated SMTP (not unauthenticated 25)
• Make sure SPF/DKIM records are valid
• Check that your IP is not blacklisted
• Send fewer messages at once (avoid bulk sends)

---

7.10 OAuth Problems (Gmail, Microsoft, iCloud)

Some providers require OAuth instead of a password.

Symptoms:

• “Microsoft requires modern authentication”
• “Sign in using a browser”
• “App password required”

Fixes:

• Update your app to support OAuth
• Generate an app-specific password
• Log in through the popup authentication window

---

7.11 “Server Does Not Support Authentication” Error

This happens if:

• You try to authenticate on a server that rejects it
• Your provider uses different SMTP servers for home vs. remote connections
• You selected “no authentication” accidentally

Fix:

Enable “Use same settings as incoming mail server” and select Normal password.

---

7.12 Large Attachments Causing SMTP Failure

Some SMTP servers reject large attachments silently.

Fixes:

• Reduce attachment size
• Use cloud storage links instead
• Check your provider’s maximum size limit

---

7.13 DNS Issues (Custom Domains Only)

If your provider can’t verify your domain:

Check:

• MX records
• SPF records
• DKIM configuration
• DNS propagation delays

Fix:

Run a DNS diagnostic using:

• MX lookup tool
• SPF check
• DKIM validator

---

8.1 Always Use Encryption (SSL/TLS)

Unencrypted SMTP was common decades ago, but today it’s considered insecure and many providers outright reject it.

Recommended settings:

• Use TLS on port 587 (most modern standard)
• Use SSL on port 465 (supported by many providers)
• Avoid unencrypted port 25 unless your provider specifically requires it

Why encryption is essential:

• Protects your password during transmission
• Prevents message interception
• Satisfies provider security requirements
• Reduces spam classification

If your provider offers both SSL and TLS, choose TLS on port 587 first.

---

8.2 SPF: Tells the Internet Who’s Allowed to Send for Your Domain

SPF (Sender Policy Framework) is a DNS record that declares which servers are allowed to send email on behalf of your domain.

Without SPF:

• Your email is more likely to be flagged as spam
• Some providers will reject your SMTP messages entirely
• Your domain becomes more vulnerable to spoofing

With SPF set correctly:

• The receiving server can verify your message came from an approved source

Example SPF record:

v=spf1 include:yourmailserver.com ~all

If you use multiple services (e.g., Gmail + your hosting provider), your SPF may include several sources.

---

8.3 DKIM: Cryptographically Proves You Sent the Email

DKIM (DomainKeys Identified Mail) adds a digital signature to your outgoing emails. The receiving server verifies this signature using a public key stored in your DNS.

Why DKIM matters:

• Confirms your message wasn’t altered
• Proves authenticity
• Increases deliverability
• Required by many major ISPs for proper inbox placement

Example DKIM benefit:

Email from a domain with DKIM enabled is much less likely to land in spam on Gmail, Outlook, or Yahoo.

---

8.4 DMARC: The Policy That Tells Providers What to Do If Authentication Fails

DMARC (Domain-based Message Authentication, Reporting & Conformance) sits on top of SPF and DKIM.

DMARC policies:

• none — monitor only
• quarantine — suspicious email goes to spam
• reject — block unauthorized email

Example DMARC record:

v=DMARC1; p=quarantine; rua=mailto:dmarc@yourdomain.com

DMARC is becoming a requirement for:

• Newsletters
• Bulk senders
• Domains sending through Gmail or Outlook
• Even small websites (Google and Yahoo updated rules in 2024–2025)

---

8.5 Reverse DNS (PTR Records)

Some receiving servers require reverse DNS records (PTR) to verify the IP sending your email resolves to your domain.

If missing:

• Emails may bounce with “PTR lookup failure”
• Some servers reject messages immediately

Typically handled by:

• Your hosting provider
• Your mail service provider

It’s essential when sending from:

• Dedicated servers
• VPS hosting
• Custom SMTP relays

---

8.6 Avoid Shared ISP SMTP Servers for Important Email

Many ISPs still offer SMTP servers, but these have limitations:

• Shared IPs sometimes blacklisted
• Volume limits
• Poor deliverability
• Often deprecated or poorly maintained
• Frequently blocked when sending from outside ISP network

Best practice:
Use your email provider’s SMTP, not your internet provider’s.

---

8.7 Don’t Use Port 25 Unless You Know What You’re Doing

Port 25 is the original SMTP port, but today it’s mostly for server-to-server communication — not end-user mail apps.

Why you should avoid it:

• Often blocked by ISPs
• No encryption (unless manually upgraded with STARTTLS)
• Higher spam risk
• Poor deliverability

Use these instead:

• 587 (TLS)
• 465 (SSL)

These give you better compatibility and deliverability.

---

8.8 Why Sending Limits Matter

SMTP servers often impose limits to prevent abuse.

Common limits:

• Messages per hour
• Recipients per message
• Total messages per day
• Attachment size limits

If you exceed them, your SMTP server may:

• Refuse to send
• Temporarily block your account
• Flag you as suspicious

---

8.9 Monitor Your Domain Reputation (If Sending at Scale)

If you send lots of email from your own domain:

• Track open rates
• Watch for bounces
• Use feedback loops (Yahoo, Microsoft)
• Monitor domain/IP reputation using third-party tools

A poor reputation means:

• High spam placement
• SMTP rejections
• Blacklisting errors

You don’t need this if you’re only sending personal emails, but it matters for business use.

---

8.10 Keep SMTP Software and Email Clients Updated

Outdated apps may:

• Use weak encryption
• Fail modern authentication
• Reject OAuth flows
• Use deprecated protocols

Always update:

• Outlook
• Apple Mail
• Thunderbird
• Phone OS
• Hosting server software

SMTP standards evolve regularly.

---

9.1 Use Your Email Provider’s Official SMTP (Best for Personal Use)

If your email is hosted by a major provider, their built-in SMTP is almost always the best option.

Examples include:

• Gmail
• Outlook.com / Hotmail
• iCloud
• Yahoo Mail
• Namecheap Private Email
• Zoho Mail
• FastMail

Why this is ideal:

• High deliverability
• Built-in security (SPF/DKIM/DMARC preconfigured)
• Works from any location
• Good spam reputation
• Supports modern authentication (OAuth, app passwords)

If your email address belongs to one of these providers, use their SMTP server — not your ISP’s.

---

9.2 Use Your Web Hosting Provider’s SMTP (Best for Domain Email)

If you have an email address under your own domain (yourname@yourdomain.com), your hosting company provides SMTP support.

Common hosting environments:

• cPanel hosting
• Plesk hosting
• WordPress hosting with email
• VPS or dedicated servers

Typical SMTP pattern:

mail.yourdomain.com

or

smtp.yourdomain.com

Why this is a strong option:

• Consistent with your domain
• Easy to configure
• Automatic server authentication
• Works with mainstream mail clients
• Integrates with your domain’s DNS

When to avoid it:

• If your hosting plan shares SMTP between many customers
• If you send bulk email
• If your server IP has a poor reputation

Hosting SMTP is best for low-volume, everyday personal or small-business use.

---

9.3 Use a Third-Party SMTP Relay (Best for Business, WordPress, and High Reliability)

If deliverability matters — e.g., customer support email, WordPress website forms, receipts, password resets — a third-party SMTP relay is the gold standard.

These services specialize in:

• Reliable sending
• Strong authentication
• High inbox placement
• Bounce management
• Reputation protection

Why use a third-party SMTP relay?

• Better deliverability than ISP or hosting SMTP
• Fewer bounces
• Dedicated infrastructure
• Reputation monitoring
• Works with nearly any app or website
• Supports modern security standards

When this is best:

• Running a business
• Sending transactional emails
• Running an online store
• Managing notifications or newsletters
• Ensuring emails don’t land in spam

Examples of common relay services:

(No affiliate links — neutral listing only)

• SendGrid
• Amazon SES
• Mailgun
• Postmark
• Mailjet
• SMTP.com
• SparkPost
• MailerSend

All of these support:

• SMTP
• API-based sending
• Bounce and complaint tracking
• High-volume sending if needed

If you run a business, these are the most reliable solutions.

---

9.4 Use Your Company’s Server (Best for Corporate Email)

If your email is part of your workplace infrastructure, your company may have:

• On-premises Exchange servers
• Microsoft 365 accounts
• Google Workspace
• Private SMTP relay servers
• Secure VPN-only SMTP access

Why use this option:

• Protected by corporate security
• Fully managed systems
• Internal deliverability requirements
• Compliance with IT policy

Downside:

• Might require VPN
• Might require IT-assisted setup
• Access restricted from outside networks

If you’re using corporate email, always follow your IT department’s instructions.

---

9.5 Use Built-In SMTP for Website Applications (WordPress, Magento, etc.)

Many website platforms require SMTP to send:

• Contact form submissions
• Order confirmations
• Notifications
• Password reset emails

Default PHP mail is unreliable

WordPress’s built-in PHP mail function often results in:

• Emails never sending
• Messages flagged as spam
• Server rejections

Best practice:

Install an SMTP plugin and connect it to:

• Your hosting SMTP
• Your email provider’s SMTP
• A third-party SMTP relay

This massively improves deliverability.

---

9.6 Using an Email Client That Supports OAuth (Modern Approach)

Some providers — particularly Google, Microsoft, and Apple — prefer OAuth authentication.

Benefits:

• No password stored in the app
• Stronger security
• Easily revoked access
• Works across devices

If your mail app supports OAuth, it’s the recommended method for connecting to your provider’s SMTP.

---

9.7 When You Should NOT Use ISP SMTP Servers

Outdated ISP SMTP servers (e.g., Comcast, Cox, Spectrum, Frontier) often have issues:

• Rate limits
• Blocks on port 25
• Bad IP reputation
• Outdated security
• Limited support outside their network
• Discontinued email services

They are NOT recommended for:

• Business use
• Newsletter sending
• Transactional email
• Any high-volume sending

ISP SMTP is generally a last resort.

---

Section 10: SMTP FAQs — Answers to the Most Common Questions

Here are the answers to the questions we receive most often from our readers.

---

1. What is an outgoing SMTP server?

An outgoing SMTP server is the system responsible for sending your email from your device to the recipient’s mail server. It authenticates you, secures the connection, and transmits your message using the Simple Mail Transfer Protocol.

---

2. What SMTP port should I use?

For most providers, the best SMTP port is:

• 587 (TLS) — Recommended
• 465 (SSL) — Also common
• 25 (Unencrypted) — Often blocked, not recommended

If 587 doesn’t work, try 465 next.

---

3. Why can I receive email but not send it?

This almost always means there’s a problem with your SMTP settings, not IMAP/POP. Common causes:

• Wrong port
• Wrong encryption method
• Authentication failure
• ISP blocking SMTP
• Incorrect server hostname

Fixing your outgoing SMTP configuration typically resolves this.

---

4. Does my SMTP server require authentication?

In nearly all cases: yes.
Most SMTP servers require:

• Your full email address
• Your password
• Sometimes an app-specific password
• Occasionally OAuth authentication (Gmail, Outlook)

Unauthenticated sending is rare today due to spam prevention.

---

5. What is the difference between SMTP, IMAP, and POP?

• SMTP sends email (outgoing)
• IMAP syncs email across all devices (incoming)
• POP downloads mail to one device (incoming, old method)

If sending doesn’t work, it’s an SMTP issue.

---

6. Can I use any SMTP server I want?

No. You must use an SMTP server associated with your:

• Email provider
• Hosting provider
• Company mail system
• Third-party SMTP relay

Using an unrelated SMTP server usually results in authentication failure or blocked sending.

---

7. Is port 25 still used for SMTP?

Port 25 is still used between mail servers, but it’s not recommended for end users. ISPs often block it, and it lacks encryption unless upgraded with STARTTLS.

Use 587 or 465 instead.

---

8.Why do I need an app-specific password for Gmail, iCloud, or Outlook?

If you enable two-factor authentication, your normal password won’t work with older email apps. An app-specific password:

• Works with SMTP
• Provides higher security
• Can be revoked anytime

Gmail, iCloud, Outlook.com, and Yahoo all support this feature.

---

9. Why does my SMTP server keep timing out?

Common causes:

• Wrong port (use 587 or 465)
• Encryption mismatch
• ISP blocking SMTP
• Firewall interference
• Server outage
• VPN interference

Changing the port or encryption often fixes it immediately.

---

10. Why are my emails going to spam?

Possible reasons:

• Missing SPF/DKIM/DMARC records
• Poor IP or domain reputation
• Sending too many emails at once
• Spammy keyword patterns
• Attachments too large
• Sending from ISP SMTP (poor deliverability)

Setting up SPF + DKIM and using a reputable SMTP improves inbox placement.

---

11. Is SMTP secure?

SMTP is secure only when encryption is enabled. Use:

• TLS (587)
• SSL (465)

These encrypt your login and message during transfer.

---

12. Do I need to change my outgoing server if I move or travel?

No, not if you use your email provider’s SMTP (Gmail, Outlook, Yahoo, etc.).
However, if you use ISP SMTP, you may only be able to send email while connected to that ISP’s network.

---

13. Why does my phone send an email but my computer doesn’t (or vice versa)?

One device is using correct SMTP settings; the other is not. Compare:

• Port numbers
• Encryption
• Username
• Password
• Authentication settings

Device syncing issues rarely affect outgoing mail; SMTP misconfiguration does.

---

14. How do I find the correct SMTP server for my domain?

Check:

• Your hosting control panel (cPanel/Plesk)
• Your provider’s support page
• Account welcome email
• DNS records
• Email app settings on another device

Most domain-based emails use mail.yourdomain.com.

---

15. Can I send bulk email through normal SMTP?

Not recommended.
Bulk sending through personal, hosting, or ISP SMTP can lead to:

• IP blacklisting
• Spam placement
• Account suspension

Use a dedicated transactional or marketing email service instead.

---

16. Why do I need TLS vs SSL? Are they different?

Both encrypt email:

• SSL is older
• TLS is the modern, more secure update

Port 587 (TLS) is the current industry standard.

---

17. Why does my SMTP server reject large attachments?

Servers impose attachment limits (often 10–25 MB). If you exceed them:

• Split the file
• Compress it
• Upload to cloud storage and share a link

---

18. Why do I get “server does not support authentication” errors?

Possibilities:

• You’re using the wrong SMTP server
• ISP SMTP only works on ISP networks
• Encryption mismatch
• Authentication incorrectly enabled for a server that doesn’t require it

Double-check provider documentation.

---

Section 11: Why SMTP?

Modern email depends on secure, reliable SMTP servers to move messages from your device to the rest of the internet. Whether you’re setting up a new email account, fixing an outgoing mail error, configuring a custom domain, or simply trying to understand why your messages won’t send, having the right SMTP settings makes all the difference.

In this guide, you learned:

• What SMTP is and how it works behind the scenes
• How to quickly identify the correct SMTP settings for any provider
• The complete A–Z directory of outgoing SMTP servers
• Step-by-step instructions for configuring SMTP in Outlook, Apple Mail, Gmail, iPhone, Android, Thunderbird, Windows Mail, cPanel, and more
• Troubleshooting techniques for every common SMTP error
• Modern email security standards including TLS, SPF, DKIM, DMARC, reverse DNS, and authentication
• Reliable alternatives to outdated ISP SMTP servers
• Clear answers to the most frequently asked SMTP questions

With the right outgoing mail server settings — and a basic understanding of how SMTP fits into the bigger picture — you can send email confidently, securely, and without the frustration of messages getting stuck in your outbox.

This article is designed to be evergreen and easy to reference, so feel free to bookmark it, share it, or return to it whenever you need a quick answer or a deeper explanation. Email is essential in your daily life and business, and with the correct SMTP setup, it just works.

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Listing Of SMTP Servers By ISP (Consolidated Table)

If you prefer a table, here’s a consolidated list of our outgoing SMTP mail servers.

ISP	SMTP Server (Outgoing)
12	012.net.il
191	mail.191.biz
191.it	mail.191.it
Access4Less	smtp.access4less.net
Active Network	smtp.activenetwork.it
Actrix Networks	mail.actrix.co.nz
Adelphia	mail.adelphia.net | smtp.blk.adelphia.net
Airtel (India)	mail.airtelmail.in | mail.airtelbroadband.in | smtp.airtelbroadband.in | smtpin.airtelbroadband.in | smtp.ncr.airtelbroadband.in
Albacom	relay.albacom.net
Albacom	smtp.albacom.net
Alcotek	smtp.alcotek.it
Alice	out.aliceposta.it
Aliceposta.it	mail.tin.it
Alise	outmail.f2s.com
Alltel	mail.alltel.net
America Online (AOL)	smtp.aol.com
Arnet	smtp.arnet.com.ar
Aruba	smtp.aruba.it
AT&T (Dialup)	mailhost.worldnet.att.net
AT&T (Broadband)	mail.attbi.com
AT&T Net (att.net)	outbound.att.net
AT&T Wireless	smtp.attwireless.net
AT&T Worldnet	mailhost.worldnet.att.net | imailhost.worldnet.att.net
AT&T Yahoo	smtp.att.yahoo.com
Atlanet	smtp.weblinea.it | smtp.atlavia.it
Atlantic Broadband	smtp.atlanticbb.net
Auna	smtp.auna.com
Bahrain Telecommunications Company	batelco.com.bh
Barak I.T.C	mail.barak.net.il
Basilicatanet.it	mail.basilicatanet.it
BCPL	mail.bcpl.net
Bella.ci	bella.ci
Bell Atlantic	gtei.bellatlantic.net | smtpout.verizon.net
Bellatlantic.net	smtpout.bellatlantic.net
Bellsouth	mail.bellsouth.net
Bestweb	smtp.bestweb.net
BEV	smtp.bev.net
Blacksburg	smtp.blacksburg.net
Blazenet	smtp.blazenet.net
Bezeq International	mail.bezeqint.net
Bezeqint	mail.bezeqint.net
Bitstop	pangasinan.com
Blu.it	smtp.blu.it
Bluebottle	mail.bluebottle.com
bluelight.com	smtp.mybluelight.com
Bluewin	mail.bluewin.ch
BlueYonder	smtp.blueyonder.co.uk
bol.com.br	smtp.bol.com.br
Brighthouse (Tampa Bay, Road Runner)	smtp-server.tampabay.rr.com
BRTURBO	smtp.brturbo.com.br
BT Internet	mail.btinternet.com
BT Openworld	mail.btopenworld.com
BTClick	smtp.btclick.com
BTTB	mail.bttb.net.bd
BusinessServe	smtp.businessserve.co.uk
BYU	nm.byu.edu
Cable One	mail.cableone.net
Cableinet	smtp.blueyonder.co.uk
CAIS	smtp.cais.net
Caiway	smtp.caiway.nl
Callsouth – Broadband	smtp2.callsouth.net.nz
Callsouth – Dial up	smtp.callsouth.net.nz
CalWeb	smtp.calweb.com
Cantv.net	mail.cantv.net
CAPU	smtp.capu.net
Cegetel	smtp.cegetel.net
CenturyLink	smtp.embarqmail.com | smtp.centurylink.net
Chariot Netconnect	mail.vic.chariot.net.au
Charm	smtp.charm.net
Charter	pop.charter.net
Charter	mail.charter.net
Charter Communications	smtp.charter.net
Cheapnet	smtp.cheapnet.it
Chello.pl	mail.chello.pl
Chicagonet	mail.chicagonet.net
ChoiceHotels.com	smtp.choicehotels.com | mail.choicehotels.com | phxsmtp.choicehotels.com
Ciaoweb	ciaosmtp.ciaoweb.it
Cingular	smtp.mymmode.com
Citizen’s Internet	smtp.swva.net
Ciudad	smtp.ciudad.com.ar
Claranet	relay.clara.net
Clear Net	smtp.clear.net.nz
smtp.claro.com | smtp.claro.com.cc, where cc = your country’s domain extension (ie. for Brazil use smtp.claro.com.br).
Click21	smtp.click21.com.br
Coastalnet	mail2.coastalnet.com
Columbia	smtp.columbia.edu
Columbia Power and Water	mail.cpws.net
Comcast / ATTBI	smtp.comcast.net (smtp.comcastbiz.net for business)
CompuServ	smtp.site1.csi.com
CompuServe Classic	mail.compuserve.com
Concentric	smtp.concentric.net
Coosahs.net (Apple Mac)	mail.coosahs.net
Covad	smtp.covad.net
Cox Business	smarthost.coxmail.com
Cox East	smtp.east.cox.net
Cox Central	smtp.central.cox.net
Cox West	smtp.west.cox.net
Crosslink	smtp.crosslink.net
CU Boulder	eces.colorado.edu
Cultura	smtp.cultura.com.br
CWCom	smtp.ntlworld.com
Daisy Communications Ltd	smtp.daisybb.co.uk | smtp.surfdsl.net
Datamat	mail.datamat.it
DCA Net	smtp-relay.dca.net
Delmarva Online	mail-gw.dmv.com
Delta Net	smtp.deltanet.com
Demon	post.demon.co.uk
Digitel Italia	smtp.etmail.it
Dinajpur	www.dinajpur.biz
DirecWay	smtp.direcway.com
Dream Net Internet	mail.dreamnet.co.nz
DSL Extreme	smtp.dslextreme.com
EarthLink	mail.earthlink.net | smtp.earthlink.net
EarthLink (International)	ismtp.earthlink.net
Easynet	smtp.easynet.co.uk
Edge	mail.edge.net
Eircom.net	mail2.eircom.net
Elitel	smtp.elitel.biz
Email.it	smtp.email.it
Enter	smtp.enter.net
Etisalat Network (UAE)	mailv.emirates.net.ae
Euronet NL	smtp.euronet.nl
EROLS	mail.erols.com
Excite	smtp.tiscali.it
Exede (Viasat)	smtp.exede.net
Ezy	smtp.ezy.et
EzySurf	smtp.ezysurf.co.nz
FairPoint	mail.myfairpoint.net | smtp.fairpoint.net
FastMail	mail.messagingengine.com
Fastweb	pop.fastwebnet.it | smtp.fastweb.it | smtp.fastwebnet.it | mailbus.fastweb.it webmail.fastwebnet.it (Italy incoming)
Fibertel.com.ar	smtp.fibertel.com.ar
Flashcom	mail.flashcom.net | smtp.flashcom.net
FloydVA	mail.floydva.net
Free | Free Telecom	smtp.free.fr
Freedom2surf	outmail.f2s.com
Freemail	smtp.freemail.it
Freemail.it (Supereva)	mail.freemail.it
Freenet | Freenet.de	mx.freenet.de
Freeserve	smtp.freeserve.co.uk
Frontier (formerly Verizon DSL)	smtp.frontier.com
Frontline	smtp.fcc.net
Full Channel	smtp.fullchannel.net
Galactica.it	smtp.galactica.it
Gateway	smtp.gateway.net
Genie	mail.genie.co.uk
GIGA	smtp.giga.net.tw
Globe Net Communications	smtp.globe.net.nz
Gmail	smtp.gmail.com
GMX	mail.gmx.net
Go Daddy	smtpout.secureserver.net
Go.com	smtp.go.com
Gran Canaria	smtp.grancanaria.es
GTI	mail.gti.net
Haier Electronics	smtp.haier-electronics.com
HiNet | HiNet.net	msa.hinet.net | ms15.hinet.net
HiWAAY.net	mail.hiwaay.net
Homestead Technologies & Intuit	smtp.homesteadmail.com
Hostglobe	smtp.hostglobe.com
Hotmail	mail.hotmail.com | mx1.hotmail.com | mx2.hotmail.com
Hotmail UK	hotmail.co.uk
HotPop.com	smtp.hotpop.com
HVA.nl	smtp.hva.nl
I4U Internet Services	mail.i4u.net.nz
IBM	smtp1.ibm.net
IBM Global	smtp1.ibm.net
Ic24	smtp.ic24.net
IG	smtp.ig.com.br
IHUG	smtp.ihug.co.nz
Inet	inet.it
Infinito	mail.infinito.it
InfoStructure — GRR Technology	smtp.grrtech.com
InfoStructure — InfoStructure	smtp.mind.net
InfoStructure — Klamath Falls Internet	smtp.kfalls.net
InfoStructure — Medford Internet	smtp.medford.net
InsightBB	mail.insightbb.com
Integra	smtp.integra.net
InterAccess	smtp.interaccess.com
Interbusiness (TI Easynet)	mail1.cs.interbusiness.it
Internet America	mail.airmail.net
Internet Highway	smtp.ihwy.com
Internet Zahav	sout.zahav.net.il
InterFree	mail.interfree.it
InternetLibero	smtp.internetlibero.it
InWind	mail.inwind.it
IOL	mail.iol.it
Iomart	smtp.domain.ext
ioNet	mail.ionet.net
IPrimus Australia	smtp.iprimus.com.au
Iprolink	smtp.iprolink.co.nz
Istruzione.it	istruzione.it
ItalyMail	mail.italymail.biz
ITOL	mail.itol.com
Ixpres.com	smtp.ixpres.com
Juno	smtp.juno.com
Jumpy	mail.jumpy.it
Katamail	smtp.katamail.com
Kataweb	smtp.katamail.com
La Poste	smtp.laposte.net
Le Neuf	smtp.neuf.fr
Libero	mail.libero.it
Lillinet	smtp.weblinea.it
Lineone	smtp.lineone.net
Lycos	email.1stup.com
Lycos UK	smtp.lycos.co.uk
Lycos.it	smtp.lycos.it
Mac.com	smtp.mac.com
Madasafish	smtp.madasafish.com
Mail2Web	smtp.mail2world.com
Mail2World	ex7.mail2web.com (requires authentication)
Mail.ru	smtp.mail.ru
Mailsnare	mail.mailsnare.net
Maktoob Mail	smtp.maktoob.com | mira0.maktoob.com | mair0.maktoob.com
MCI2000	mailrelay.internetmci.com
McLeodusa	email.mcleodusa.net
McLink	mail.mclink.it
Media One	smtp.ce.mediaone.net
Mediacom	mail.mchsi.com
Mega Path	mail.megapathdsl.net
MidMaine.com	mail.midmaine.com
Mid Hudson Cable	outgoing.mhcable.com
Mindspring	smtp.mindspring.com
Mistral	smtp.mistral.co.uk
Momax	smtp.momax.it
Mpower Communications	smtp.mpowercom.net
MSN	smtp.email.msn.com
Msoft.it	smtp.weblinea.it
Mtel	mail.mtel.net
MWEB (South Africa)	smtp.mweb.net
NamesToday	smtp.namestoday.ws
Nerim.net	astralblue@nerim.net
Nerim SAS	smtp.nerim.net
Netcabo	smtp.netcabo.pt
Netexplora Chile	mail.netexplora.com
Netlink (New Zealand)	mail.netlink.co.nz
Netscape	smtp.isp.netscape.com
NetscapeOnline UK	mailhost.netscapeonline.co.uk
Netvigator	mail.netvigator.com
Netvisão (Portugal)	mail.netvisao.pt
NetZero.com	smtp.netzero.com
Neuf Telecom	smtp.neuf.fr
NGI	smtp.ngi.it
Nildram	smtp.nildram.co.uk
Nittany Media, Inc.	smtp.nittany.com
Noos	smtp.noos.fr
Novell	smtp.novell.com
Novis (Portugal)	mail.novis.pt
NTL (UK)	smtp.ntlworld.com
NTLWorld	smtp.ntlworld.com
Netcom.com	smtp.ix.netcom.com
Netexpress.net	netexpress.net
NetHere	mail.nethere.net
Netscape	smtp.isp.netscape.com
Netzero	smtp.netzero.net
NRVi.net	mail.nrvi.net
NTELOS	mail.ntelos.net
NYU.edu	is4.nyu.edu
Omega Communications	smtp.i-plus.net
OneTel	mail.onetel.net.uk
Ono	smtp.ono.com | wanadoo.fr
Optonline (Cablevision’s Optimum Online)	mail.optonline.net
Orcon	mail.orcon.net.nz
P.C.T.S.	ns.pcts.sk
PacBell	mail.pacbell.net
Paradise Net (New Zealand)	smtp.paradise.net.nz
Paonline	out.paonline.com
PCHome (Taiwan)	smtp.pchome.com.tw
People PC | PeoplePC	smtpauth.peoplepc.com | mail.peoplepc.com
People PC	mail.peoplepc.com
Pipex	smtp.dsl.pipex.com | smtp.dial.pipex.com
Pixius	smtp.citilink.com
Post Man	mail.postman.net
Poste.it	relay.poste.it
Postino.it	smtp.postino.it
Previdencia (Brazil)	kiwi.previdencia.gov.br
Prodigy	smtp.prodigy.net | xasa.com
Prodigy(TELMEX)(Mexico)	smtp.prodigy.net.mx
Promo.it	smtp.promo.it
PSINet	bbr0-f1.sna.com
PSI.net	relay.smtp.psi.net
PSU.edu	smtp.psu.edu
PTD.net	mail.ptd.net
Purplenet (UK)	smtp.purplenet.co.uk
Qos.net.il	mail.qos.net.il
Quipo	quipo.it
Quizil.net	mail.quizil.net
R (Cable Galicia)	smtp.mundo-r.com
Radio Deejay Mail	smtp.deejaymail.it
RCN.com	smtp.rcn.com
RCP (Peru)	amauta.rcp.net.pe
ReteItaly	smtp.reteitaly.com
Rider.edu	enigma.rider.edu
Road Runner (Hawaii)	smtp-server.hawaii.rr.com
Road Runner (San Diego)	mail.san.rr.com
Rogers	smtp.broadband.rogers.com
RunBox	smtp.runbox.com
Sapo (Portugal)	mx.sapo.pt
SBC Global (Yahoo!)	smtp.sbcglobal.yahoo.com
SBC Global (Yahoo Ameritech)	smtp.ameritech.yahoo.com
SBC Global (Yahoo Flash)	smtp.flash.yahoo.com
SBC Global Pacbell	smtp.pacbell.yahoo.com
SBC Global Prodigy	smtpauth.prodigy.net
SBC Global SWBell	smtp.swbell.yahoo.com
SBC Global (Yahoo NVBell)	smtp.nvbell.yahoo.com
SBC Global (Yahoo SNet)	smtp.snet.yahoo.com
SBC Global (Yahoo Wans)	smtp.wans.yahoo.com
SBC Yahoo DSL (SBCYahoo.dsl)	smtp.sbcglobal.yahoo.com
Scarlet | Scarlet.be	smtp.scarlet.be
Screaming.Net	smtp.tiscali.co.uk
SDSU	rohan.sdsu.edu
Shentel	smtp.shentel.net
SFR (French Mobile Telephone)	smtp-auth.sfr.fr
Shaw Canada	mail.shaw.ca
Shylex Telecomunicaciones	smtp.shylex.net
SiFree.it	smtp.simail.it
Sify.com	mail.satyam.net.in
Sina.com	smtp.vip.sina.com | smtp.sina.com.cn
Skynet | Skynet.be	relay.skynet.be
Slingshot	smtp.slingshot.co.nz
Softhome.net	mail.softhome.net
SouthNet	smtp.southnet.co.nz
Southwestern Bell	mail.swbell.net
SpeakEasy	mail.speakeasy.net
SprintPCS	smtp.sprintpcs.com
Spymac	mail.spymac.com
StofaNet.dk	mail1.stofanet.dk
Sunrise (Switzerland)	smtp.sunrise.ch
Supanet	smtp.supanet.com
Supereva	mail.supereva.it
SuperFree.it	smtp.superfree.it
SwissCom (Bluewin)	smtpauth.bluewin.ch
Sympatico	smtp1.sympatico.ca
Sysnet	mail.sysnet.net
Tag Comunicazioni	64.94.0.31
TalkTalk	smtp.TalkTalk.net
Tariffe.it	smtp.tariffenet.it
TDC	backup-mx.post.tele.dk
TELCEL (Mexico(	smtp.itelcel.com
Tele2.fr	smtp.tele2.fr
Tele2.it	smtp.tele2.it
Tele2Internet	virtual.everyday.com
Telecom	mail.cs.interbusiness.it
Telecom (Alice)	mail.tin.it
Telecom ADSL (Business)	smtp.191.it
Telecom ADSL (Business)	mail.191.it
Telecom Italia	191.it
Telecom Smart	mail.tuttopmi.it
Telecom Xtra	smtp.xtra.co.nz
Teleconomy Internet	mail.191.it
TELEDISNET.BE	mail.teledisnet.be
Telefonica	smtp.telefonica.net
Telenet (Belgium)	uit.telenet.be
Telepac (Portugal – ADSL)	smtp.telepac.pt
Telewest (UK)	smtp.blueyonder.co.uk
Telkom | Telkomsa.net	smpt.telkom.net
Telocity.com	smtp.telocity.com
Telstra (Australia)	mail.bigpond.com | mailhost.mobilenet.telstra.net
Telus | Telus.net	smtp.telus.net
Telvia.it	smtp.telvia.it
Terra (Spain, España)	smtp.terra.es | smtp.mailhost.terra.es
Terra (Brazil)	smtp.sao.terra.com.br
Terra – BR – Recife	smtp.rec.terra.com.br
Tesconet	mail.tesco.net
TIM.it	mail.posta.tim.it
Timenet ADSL	smtp2.xdslnet.it
Tin.it	out.virgilio.it
TIN.IT free (Funziona Con Alice)	mail.clubnet.tin.it
Tiscali	smtp.tiscali.it
Tiscali (UK) | Tiscali.co.uk	smtp.tiscali.co.uk
Tiscali (Germany) | Tiscali.de	smtp.tiscali.de
Tiscali (Spain)| Tiscali.es	smtp.tiscali.es
Tiscali (Netherlands) | Tiscali.nl	smtp.tiscali.nl
T-Mobile	myemail.t-mobile.com
Tnet	mail.tnet.it
T-Online	mailto.t-online.de
Tol.it	smtp-tol.it | smtp.tol.it
Totalise	mail.totalise.co.uk
TRE	smtp.tre.it
Tugamail	mail.tugamail.com
TuttoGratis.it	smtp.eutelia.it
TVTel	tvtel.pt
UCCS	smtp.uccs.edu
UCSD	smtp.ucsd.edu
UCSF	mail.ucsf.edu
UKGateway	smtp.ukgateway.net
United Mail Systems	unitedemailsystems.com | smtp.unitedemailsystems.com
University of Maryland	mail.umd.edu
UMBC	smtp.gl.umbc.edu
UOL	smtp.uol.com.br
UOL Sinectis Argentina	relay.uolsinectis.com.ar
US Cable	smtp.warpdriveonline.com
USA.net	smtp.postoffice.net
Utenti Interbusiness Telecom	mail.cs.interbusiness.it
Utopia Systems	smtp.utopiasystems.net
Utu.fi	smtp.utu.fi
V 21	smtp.v21.co.uk
Velocityhsi.com	mail.velocityhsi.com
Verio	mail.verio.net
Verizon FIOS	outgoing.verizon.net (port 465, enable SSL)
Verizon | Verizon DSL	outgoing.verizon.net | smtpout.verizon.net
Verizon (iPhone)	outgoing.verizon.net (for Verizon Internet customers) | smtp.gmail.com
Videobank	videobank.it
Virgilio	out.virgilio.it
Virgin	smtp.virgin.net
Virginia Tech	smtp.vt.edu
Vispa	mail.vispa.com
Vivacity	pop.Vivacity.it
Vodafone Germany	smtp.vodafone.net.de
Vodafone India	mail.vodafone.net
Vodafone Italy	smtpmail.vodafone.it
Vodafone Spain	smtp.vodafonemail.vodafone.es
Vodafone UK	smtp.vodafone.net
Waitrose	smtpmail.waitrose.com
Wanadoo	smtp.wanadooadsl.net
Wanadoo (France)	smtp.wanadoo.fr
Wanadoo (Spain, España)	smtp.wanadoo.es
Wanadoo.nl	smtp.wanadoo.nl
Waypoint	mail.wayport.net
Web.de	smtp.web.de
Webmail.is	smtp.emailsrvr.com
Which Online	mail.which.net
WildBlue	smtp.embarqmail.com (use outgoing authentication and SSL on port 465)
Windows Live Hotmail	smtp.live.com
Wooow.it	smtp.wooow.it
World-Net	mail.world-net.co.nz
Worldonline	smtp.tiscali.co.uk
X-Privat	mail.x-privat.org
XS4ALL | Xs4all.nl	smtp.xs4all.nl | mail.xs4all.nl
Xtra	smtp.xtra.co.nz
Ya.com	smtp.ya.com
Ya.com (ADSL)	smtp2.adsl.ya.com
Yahoo | Yahoo.com	smtp.mail.yahoo.com
Yahoo (SMTP Authentication)	smtp.mail.yahoo.com
Yahoo Canada	plus.smtp.mail.yahoo.com (Yahoo Plus!) use SSL, port 465, & authentication
Yahoo (China)	smtp.mail.yahoo.com.cn
Yahoo (Spain, España)	yahoo.es | smtp.correo.yahoo.es
Yahoo Argentina	smtp.mail.yahoo.com.ar
Yahoo.co.uk (Yahoo UK)	smtp.mail.yahoo.co.uk
Yahoo (Taiwan) | Yahoo.com.tw	smtp.mail.yahoo.com.tw | stmp.mail.yahoo.com
Yahoo (Germany) | Yahoo.de	smtp.mail.yahoo.de
Yahoo.it	smtp.mail.yahoo.it
ZeelandNet	mail.zeelandnet.nl
Zero (Japan) | Zero.ad.jp	zero.ad.jp
Zimbra	zimbra.keepnet.net
Ziplink	smtp.ziplink.net
ZNET	mail.znet.com
Zonnet	smtp.zonnet.nl

Still Can’t Find Your Outgoing SMTP Server?

If you can’t find your outgoing email SMTP server in the list above, let us know in the comments and we’ll try our best to find it for you. Thanks for assisting us in building the most comprehensive outgoing server list possible!

Got Your Email To Send But All You See Is Spam?

Did you finally get your outgoing email working, but on the incoming side you see nothing but garbage and spam? Our experts illustrate two tried and true solutions to stopping spam.