Alternate ports on Outbound mail domains

I am asked to have my Exch2003 bridgehead server deliver outbound mail on
alternate ports, a different port for each mail domain, like this
1) for mail domain "domain1.com" mail should be delivered on server
"non-exchange-mailserver" on port 2525
2) for "domain2.com" on port 2526
3) for "domain3.com" on port 2527
4) for the Internet on standard port 25 on target servers

By testing I found out that this can be done by adding 3 new ip-addresses to
my Exch2003 bridgehead server, each with a new SMTP Virtual Server that
listens for inbound mail on standard port 25 and delivers outbound mail on
alternate ports 2525, 2526 and 2527, and each with a new SMTP Connector that
handles the maildomain.

Q: This appears to me as a very clumsy way to do it, and I don't want to add
ip-addresses to my server.
Anybody knows a smarter method ?

Thanks.
Best regards
Peter Juuls


.

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