[exim] copying emails to two smtps

Hello,

I am setting up a testing mail server, in order to test it, I'd like to route
incoming mails to it but they should also be sent to the current server, how
do I do that?

Now I have Exim -> iPlanet

I need Exim -> iPlanet
                    -> Postfix

In order to have a the end Exim -> Postfix

Is there any way to do that?

Thank you
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Stéphane Konstantaropoulos -- Web Developer