From: Andres Tarallo (ataralloacm.org)
Date: Tue Aug 29 2006 - 13:34:15 CDT

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Thanks specially for mouss and Curtis Doty, based on your advice we
made it work. And of course to Wietse fr creating Postfix !!!!

We're migrating gradually, so exchange will be coexisting with
Postfix. For doing this we created in Exchange 5.5 a Virtual address
(usernewserver.domain.site) and made the migrated account point to
there. Its a laborious work, but it lets us migrate gradually.

Andres

2006/8/27, Andres Tarallo <ataralloacm.org>:
> Hi!!!
>
> I'm needing some advice in performing a migration from exchange to a
> Postfix based Mail server (Under SuSE Linux 10.1).We have a
> constraint: the migration must be done gradually, some users at a
> time. Since we can't touch much the exchange server we thought to
> develop the following architecture:
>
>
> Internet ---> Content Filter Server ---> Postfix Server ---> Exchange
> (Exchange 5.5)
>
> Mail coming from the Internet goes through the content filter, being
> delivered to the Postfix SMTP server. At the Postfix some mail might
> be left there, some mail should be sent to the exchange 5.5 server.
>
> Exchange expects to receive mail delivered to him as
> usernamedomain.site. We made the following setup: in the virtual
> table of Postfix we made mappings as follow: userdomain.site
> usernewserver.domain.site and this let us receive mail for the users
> in that server as local users. With the exchange users we made a
> slightly different thing: user2domain.site
> user2exchange.domain.site With this setting we get many bounces.
>
> We tried using the transport table, but this table overrides all the
> users in the virtual table. I'm aware that this can be done with
> Postfix. but I'm not understanding very well how mail is delivered.
>
> Any help to solve this problem is appreciated.
>

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