How can I change the incoming SMTP port of Microsoft Exchange 5.5?
Microsoft Exchange Server 5.5 doesn’t directly support changing the incoming port for SMTP mail. In some circumstances (you have a firewall/router with network address translation) you may be able to direct incoming mail to the NoSpamToday proxy on another port, which can then pass it to the Exchange server on port 25. This may not be possible or desirable, e.g. when using applications that do not support configurable destination ports, or when there is no possibility for port translation, or when there are simply too many sources for messages that it would be inconvenient to reconfigure them all. In these circumstances you can change the Exchange Server’s incoming SMTP port by editing the ‘services’ file, found in \WINNT\system32\drivers\etc\ for example.
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