I am trying to do the following. I have a Exchange 2007 Single Server setup as well as a Linux Postfix Email setup on a single server as well to.
The goal is to have all mail go to the Linux Postfix server - @company.com then forward a copy to the Exchange Server (currently as company.local). There will be some users who only want the Linux Postfix (as its our primary and they do not want to conform to Exchange at all) Otherwise I would not be asking here. But the other half will be using Exchange as primary. Currently we have it semi working for external email usage from both Exchange and Linux and when we send emails from Exchange it shows our @company.com address as the sender.
The problem we have run into is when we send email from the Exchange users to the Linux users they are not receiving the emails, they are delivered to their Exchange accounts only. And that needs remedied, unfortunately I am not skilled enough to know how to do this.
The cycle needs to be All Email is delivered to Linux, a copy is forwarded to Exchange. Users using Exchange know that Linux emails will not sync obviously but they have no problem with policing that once a month or such. Mainly doing this because some of us hate POP/IMAP email and the others hate Exchange... Go figure. In the end if we cannot achieve this, the Exchange users will lose as this was a bet/test theory that both can coexist and both users benefit for what they want to use.
All help is appreciated.