I’m so confused about “Relaying Denied” errors.
Our primary SMTP server does NOT require authentication, and does NOT require the “from” email address to be associated with a particular domain.
Most of the time, we send mail from whatever address we are using for a particular correspondent with no problem at all. Emails get to where they’re going and don’t bounce back as long as they’re valid addresses.
However, on some occassions, using MS Outlook, when my boss sends an email to one of us @amerigocompanies.com, the email will bounce back with “550 5.7.1
This is different from a “Relaying denied” error message that pops up on the screen before the mail goes out.
I run into this at home using Max Bulk Mailer for a newsletter I manage, going out through a properly-authenticated SMTP server. Out of 1,500 or so recipients, 10 or 12 of them will bounce back with this error message.
What gives? What settings need to be changed? Since we don’t have any logins for our SMTP server, how can we authenticate?
