I’m trying to get my Drupal 6.x site to send emails using the SMTP Authentication module. I have it fine working on other sites, and the site I’m having trouble with will actually send an email form the contact form, but when I try to register a new user, or even send a test email from the SMTP configuration page, I get this error message: 550 5.1.0 : Sender address rejected: User unknown in relay recipient table, along with a bunch of other garble.
Any ideas web rockers?
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