Wietse: > Why do you believe that it complains about the "From" address in > the email header, instead of the SMTP "MAIL FROM" address?
Michael Way: > Sorry Wietse, my bad you are correct. It is the MAIL FROM: I > should have included the full line: 550 5.7.1 Client does not > have permissions to send as this sender (in reply to MAIL FROM > command)) sender_canonical_maps should take care of this. In /etc/postfix/main.cf: sender_canonical_maps = pcre:/etc/postfix/sender_canonical sender_canonical_classes = envelope_sender Note: no whitespace before those lines. In /etc/postfix/sender_canonical: if /[[:<:]]example\.com$/ /./ y...@example.com endif Note: no whitespace before those lines. That will replace a MAIL FROM sender not in your domain by your own address. Wietse