On 2015-09-30 04:36 PM, Infoo Matic wrote:
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

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https://inverse.ca/sogo/lists

That's what I figured, but I couldn't find out how to send all email on SOGo (or Exchange) to an external postfix to make that decision. If it's internal email, it never seems to leave the system.

Thanks,
Gerald






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