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I think I am going to port forward all mail to a server running postfix, then use the postfix /etc/postfix/relay_domains and /etc/postfix/transport config files to route mail to the appropriate...

If I change all the MX records to all point to the same public IP, how to I route the appropriate mail to the appropriate server? e.g.

We currently poke holes in the router for mail by port...

I have a client that has several offices in different physical locations, each with their own hosted email servers in a variety of flavors (postfix, exchange, unix mail). Each location has a...