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Selective internal routing

Selective internal routing

Selective internal routing

Our current sendmail system for handling incoming mail for looks something like this:

    Internet ===> smtp server ===> mail delivery server

(this is a simplification that just represents the path mail being sent to our local users takes).

We're currently looking at implementing Zimbra as an optional way to handle mail for select users.  Zimbra will be running on a separate system from the existing mail delivery server, so at some point - probably on the smtp server - we need to be able to look up the recipient of each incoming mail and deliver it to either the existing mail delivery server or to the new zimbra server.

What is the best way to approach this?  I'm fairly adept at writing sendmail rules, but selecting an alternate server for local delivery has me a bit stumped.  Any assistance would be much appreciated.


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