Pete’s last blog entry reminded me of another handy tip that every mail administrator should know.  Postfix allows you to enable an alternate port for outgoing mail traffic.  This is especially convenient when you have users that have problems sending mail through their home internet provider.  Most ISP’s will block port 25 to anywhere but their own mail servers.  This usually means that users have to change their outgoing mail server preference everytime they are at home and then change it back when they get to the work place.

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