On Mar 3, 2018, at 14:31, Ben Lavender <b...@airnet.org.uk> wrote: > I’m looking to disable submission on port 25 and therefore have postfix as a > relay only server.
You SHOULD disable submission on port 25, but that doesn't mean you have to be a relay-only server. Put submission on port 587. (Or disable submission entirely, of course) -- My main job is trying to come up with new and innovative and effective ways to reject even more mail. I'm up to about 97% now.
