Redirecting port 587 to port 25 will by definition involve an outside (the firewall) IP address
people here have reported port mapping/redirecting utilities that run on the port 25 box to re-direct port 587 to port 25. no "outside" firewall or IP involved.
Ideal configuration: 587 SMTP-AUTH only, local or relay. 25 SMTP local, no relay; SMTP-AUTH local or relay.
Actual configuration (with the firewall mapping External 587 to 25): 587 SMTP local, no relay; SMTP-AUTH local or relay. 25 SMTP local, no relay; SMTP-AUTH local or relay.
No difference in functionality. The only difference I can see is if a Spammer is sending the same junk to both interfaces, you'd get the Spams twice.
... nice!! :)
But, SpamAssassin (http://www.visioncomm.net/sac) is killing both copies.
... port 587 accepting all non-AUTH mail to local domains is another spam sink to defend, EVEN more SMTPD sessions for IMail to try to handle. A lot of Imail machines have trouble keeping up with one port 25, never mind a 2nd SMTP port.
Len
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