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Run your smtp and pop3 server on localhost, and redirect those ports on the external interface to localhost:25 and localhost:110. How you get external mailservers to talk to your port 250 is a different story .. unless you have control over your upstream backup MX where you can manipulate the port it will connect to.
Code:
rdr on $ext_if proto tcp from any to $ext_if port 250 -> 127.0.0.1 port smtp rdr on $ext_if proto tcp from any to $ext_if port 1100 -> 127.0.0.1 port pop3 |
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See http://www.freebsdonline.com/content/view/346/355/ for a Squid example of the same.
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