Inbound mail to 2 MTAs

My company is migrating from Sendmail to Zimbra. We use Exim 4 as our
smtp gateway server.

We plan to run both mail servers in parallel for a short period while
we make the transition.
I would like to have the Exim gateway server send copies of inbound
mail to BOTH mail servers ( Sendmail and Zimbra). Also, I would like
to configure Exim to also send copies only for specify users.

How do I make this happen?


TIA

On Tue, 24 Mar 2009 06:26:52 -0700 (PDT), Snake Oil
<pxeboot@gmail.com> wrote:

>My company is migrating from Sendmail to Zimbra. We use Exim 4 as our
>smtp gateway server.
>
>We plan to run both mail servers in parallel for a short period while
>we make the transition.
>I would like to have the Exim gateway server send copies of inbound
>mail to BOTH mail servers ( Sendmail and Zimbra). Also, I would like
>to configure Exim to also send copies only for specify users.

If that was me doing this I would do the work on the Sendmail server,
i.e, using forwards and the like.

I am going through this at the moment with a Scalix to Exchange
migration, and rather than mucking about with the gateway machines I
am using rules on the Scalix machine (also running Sendmail) to
forward the mail to the user's Exchange box. This also means that
internal mail (which never touches the gateway machines) is also
flowing correctly.

Thanks.
Andrew.