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Date: Mon, 23 Apr 2007 11:28:12 -0700 (PDT)
From: Philip Hallstrom <freebsd@philip.pjkh.com>
To: Tom Grove <freebsd@voidmain.net>
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> Does anyone have any ideas on how I would solve the following problem?
>
> I have two mail servers.  One is running cyrus imap and the other courier.  I 
> am in the process of moving users over one at a time and would like to put 
> some kind of proxy box in front of the mail servers.  I would like to have 
> the proxy listen on port 143 for connections and grab the usernames.  Once 
> this happens I want the users connection routed to the appropriate mail 
> server.
>
> Any ideas?

I've never used it myself, but perdition comes up when this gets asked...

http://www.vergenet.net/linux/perdition/