I have a problem with courier server - especially SMTP module.
I send a mail through transparent mail proxy on our firewall. When the primary MX of recipient's domain in unreachable, i get this reply from relay:
421 4.4.1 Unable to contact destination
Other MX records aren't tried and the mail is deferred. I'd like courier to contact backup MX'es before deferring the mail.
How can I achieve this?
Thank you very much for answer.
Martin Horak
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