I currently have all my users using the submission port for outgoing
mail. They cannot send on port 25 at this time, and according to all of
the online tests I have tried I am not an open relay or backscatter sprayer.
My master.cf currently shows:
smtp inet n - - - - smtpd
-o smtpd_use_tls=no
-o smtpd_sasl_auth_enable=no
-o content_filter=smtp-amavis:[127.0.0.1]:10024
If I change smtpd_sasl_auth_enable to yes, it allows some devices
(handhelds, Treo, etc.) to send on port 25 if authenticated, but I want
to make sure that this does not turn me into a relay or anything before
doing so. I have attempted to relay through it while it's enabled, and
they were denied. I decided to err on the side of caution and check
with the experts here before "just doing it" in case there were any
pitfalls or gotchas I do not know about.
Thanks.
