[email protected]:
> Hello,
>I would like to progressively restrict the ability for users to
>impersonate other email addresses when they use our authenticated
>SMTP (Postfix + Dovecot). We have about 2500 users on this SMTP
>server but we have about 50K total users and 60K email adresses.
>As a first step I would like to setup a diagnostic to find out who
>is sending emails that would violate a given smtpd_sender_login_maps,
>without triggering a true Reject. A line in the log file would be
>great.
>
>Is that possible?
Postfix has a universal "warn if you would reject" feature:
/etc/postfix/main.cf:
smtpd_mumble_restrictions =
...
warn_if_reject reject_sender_login_mismatch
...
It's designed for testing new rules.
Wietse
