Exchnage 2010 to Ex2003 routing problem
Posted on 2011-09-27
Hello all -
We have three sites in a hub and spoke config all with their own Exchange servers. They were all running Ex2003 and life was good. Then the two 'remote' sites were upgraded to Exchange 2010 with the 'main' site staying on Ex2003.
Now we have a mail routing problem we can not figure out. Internal mail works just fine everywhere. Mail from the internet gets delivered everywhere as well. However mail destined for the Internet has problems.
If there is no send connector configured in Ex2010, then the 'main' site that is on 2003 can send mail externally without an issue. The two remote site cannot send external email though.
If we create a send connector not using a smarthost, then all email from all three sites is then sent through the associated Ex2010 remote site. This is not what we want and does not really work due to MX lookups.
If we create a send connector that uses the Ex2003 sever as a smarthost, then all email just dissapears into la la land.
The Interop RGC connector is there as seen below -
Name SourceRoutingGroup TargetRoutingGroup
---- ------------------ ------------------
Interop RGC Exchange Routing Group (DWBGZMFD01QNBJR) First Routing Group
Interop RGC First Routing Group Exchange Routing Group (DWBGZMFD01QNBJR)
So...any thoughts as to what is going on and how to fix it?
To be clear, we want all Internet email to be delivered by the Ex2003 server at the 'main' site. Ex2010 just does not seem to want to route it there nicely.
Thanks in advance -