Not sure if anyone has a fix for this or not, but I thought I would put it out there... I changed all incoming mail from the world to go through exchange 2003 instead of my groupwise gwia. I added a bunch of more threads for incoming and outgoing on the groupwise exchange gateway.

The exchange server routes emails fine, but they begin to backup in the exchange servers queues. The MTS-OUT que on the exchanger server builds and builds and emails don't get delivered for a long time.

After this happens I put the incoming mail back into the gwia which delivers them much faster.

Has anyone seen this before or does someone with exchange experience have a fix for that backlog?