I just got smtpd_sender_maps to work with smtpd_sender_restrictions using
reject_authenticated_sender_login_mismatch.
While researching how that worked, I saw information indicating that you could
apply the reject_sender_login_mismatch to the smtpd_recipient_restrictions.
Can someone explain how that would work? I am picturing mail being delivered to
one of my users from the internet. How does my mail server know if the sender,
of a message from outside of my domain, has a login mismatch?
Thank you in advance for your help wrapping my brain around this concept.
smtpd_recipient_restrictions are applied at the RCPT TO: stage (that is,
after connection, HELO, and MAIL FROM).
Where you apply a restriction is only limited by the /first/ stage it
may appear in - all restrictions may appear in
smtpd_recipient_restrictions, since it is the last one.
Of course, this setting has no effect for non-authenticated connections.
J.
