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How to forward a group of email address to another server while still having others delivered localy ?

isstar asked
Last Modified: 2013-12-17

I have to setup a new mail server. I have only one domain and the new server will be the MX for this domain. But I have to deliver some addresses to another  server (Exchange) and others emails addresses are delivered localy. I can't use pop connector from Exchange server because it's to slow (check every 15 min). The domain on the Exchange server is also the same so I can't use standard forwarding.

I can use FreeBSD (preference) or Linux as OS and Exim (preference), Qmail or Postfix as MTA.

I can I do that ?
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Most Valuable Expert 2015

I'm pretty sure exim, qmail and postfix will do what you need.  I can only speak from Sendmail experience to confirm that a forwarding by user or domain is possible.

If you prefer one MTA over the other, identify it and we can identify the configuration parameters.

Worst case, if you don't know what MTA you want, a '.forward' file in the user's home directory will suffice.
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I think I can't do that because domain on Exchange and Linux server is the same.

For example on my Linux server I have a domain foo.com and 2 emails bar@foo.com et rab@foo.com. My Exchange server is also configured with foo.com domain but there is only the address bar@foo.com. So the first linux server have to forward bar@foo.com on Exchange server and delivered locally rab@foo.com.
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Exactly as Jesper has said, after the @ you just point it towards your exchange server and it will automatically forward the email on without attempting local delivery.

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