Have seen some ancient threads that say the contrary, but just want confirmation for v4.8.3 – with authentication mode “SMTP Auth available, TLS optional” – this does NOT allow relaying, correct?
In other words, there must be a POP or IMAP authentication prior to being able to relay email through the mail server.
netstat -an | grep 25
shows pakistan, china and friends connected via smtp. Whether or not they’re allowed to do anything, I don’t know.
Is the mail server secure out of the box, or do I have to do some tightening up? Would really prefer not finding my server on an SBL.