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I have someone with two domains, and is running a postfix server on the mx host for the domain and I have total control of the server. is running an exchange server on the mx host for the domain and I do not have any control of this server.

They have been using as their primary mail address and use the exchange calender with outlook.

They want all the same functionality but want to start using as primary mail address.

I opened up postfix to allow relay from the ip address of the exchange server and hopefully that's enough from the outgoing side.

For delivery though what can I do to forward all incoming emails to the exchange server? I have some aliases defined in /etc/aliases that should take higher priority.

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up vote 2 down vote accepted

you'll need to set up a transport map for where the map consists of something like:

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