We have setup postfix, dovecot on our new server and have no issues sending or receiving e-mails from the server directly. However, when we try to send mails out
from outlook/thunderbird, it fails with the following error message(s):
## postfix/smtpd: NOQUEUE: reject: RCPT from abc.domain.net[<ip_address>]: 454 4.7.1 <firstname.lastname@example.org>: Relay access denied; from=<email@example.com> to=<firstname.lastname@example.org> proto=ESMTP helo=<mydel>
I have added domain.net to mynetworks, but still I get the same error.