I have an issue with split responsibility for a domain in exchange.
Details are as follows:
SBS 2011 (exchange 2010)
We manage this office
We download email via pop connector from a plesk web server and we send mail as domain.co.uk from the exchange server (we actually use a smarthost).
Unknown system, not managed by us
Also have users with domain.co.uk emails
they presumably download mail for their respective users from the same plesk server.
All of the above works well, except that sometimes users from Office A need to email users of Office B - these emails are bouncing.
I assume that our sbs 2011 server thinks it should try and deliver these emails locally, but of course the users do not exist on our system.
The annoying thing is, we have just upgraded (fresh install) from a sbs 2003 system - and on that system it all worked fine, and I probably set it up as well, but I cant remember how I got it working.
What is the correct way to do this?