Hi,
I would like to completely cut off all mail leaving my servers that have not
originated from a FreeBSD jail running postfix (plus rspamd).
These are my measures taken sofar:
#) Using FreeBSD's pf firewall functionality to block all traffic leaving my
servers via ports 25, 465, and 587, respectively, that has not originated
in a FreeBSD jail running postfix
#) Disallow relaying except for SALS authenticated users:
smtpd_relay_restrictions =
permit_sasl_authenticated
reject_unauth_destination
#) Deny local mail submission to all users:
authorized_submit_users =
All my test are showing that my goal has been achieved, *but* I may have
overseen something I should prevent, as well. Have I?
Any feedback is highly appreciated.
Thanks and regards,
Michael
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