forcing qmail to pass outgoing mail to another SMTP server

Charter communications blocks all outgoing traffic on port 25 that is not destined for its SMTP server. This means that if you run an SMTP server on your local network and are trying to send out e-mails to other servers on port 25, it will not work. To bypass this (using qmail), setup a file called /var/qmail/control/smtproutes and in it do the following:

example1.com:smtp.anotherserver.com:2525
This tells qmail to send all e-mails destined for example1.com through smtp.anotherserver.com on port 2525 thus bypassing the port 25 blocking by your ISP.

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