I would use postfix as my main server. If postfix does not find a mail address when looking up on the sogo server then it should relay to the exchange server. The exchange server uses postfix as relay: postfix decides again whether the mail should be kept within the sogo server or should be relayed back to exchange.
Had a similar setup when I migrated a customer away from IBM Lotus Domino, hope this helps. regards, infoomatic On Wednesday, September 30, 2015 20:41 CEST, Gerald Brandt <[email protected]> wrote: > Hi, > > I currently have a 2003 (NOT R2) exchange server. I have an almost > working SOGo/Openchange install. > > I'd like to migrate my users over slowly. for example, [email protected] > goes to SOGo and [email protected] goes to exchange. I can actually take > care of incoming email quite easily, just a postfix server with rules > for email addresses, no biggie. > > The problem is when [email protected] sends email to [email protected]. > Normally, SOGo would look and say 'hey, this user doesn't exist'. > Instead, I want it to forward all unknown domain emails to the exchange > server. I'd love exchange to do the same, but have even less of an idea > how to do that. > > Any ideas or comments from people that may have done an incremental > migration? > > Gerald > > -- > [email protected] > https://inverse.ca/sogo/lists -- [email protected] https://inverse.ca/sogo/lists
