How to do mail mirroring?

Question

linux

Good afternoon!

There is incoming mail using protocols 110/143 to the main mail server. How to make incoming mail on ports 110/143 mirrored to another mail server?

Answer 1

pop3 and imap are not mail delivery protocols. This is a mailbox access protocol.
And mail - it goes on smtp. Set up there.

Answer 2

mirrored to another mail server

need sync to another server (imapsync or rsync)
to another mail address - then aliases or via procmail