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 ?