I need to have email sent to port 25 for SMTP mail (Exchange 2007) from the Internet mapped to a different internal port.
I have Exchange 2003 server that is running a sonic wall spam filter (not a good practice but it is what we have - for now). The spam service receives mail on port 25 from the PIX and sends mail to the Exchange 2003 server listening on port 2525. This has works for a long time.
We are adding a new Exchange 2007 server that will replace the Exchange 2003 server after adequate testing (a month or so). The issue is the Exchange 2007 can ONLY use port 25 to talk to the Exchange 2003 - Per Microsoft's tech support - and CAN NOT be changed. So my easy workaround is to have the spam firewall listen on port (xxxxx) and forward the mail to exchange on port 2525 and let the routing group connector use port 25.
What is the command for the PIX to translate port 25 externally to another port internally (12345 for example).
Let me know what other information you need. Thanks!