Messages awaiting directory lookup queue stuck and growing!

[bert113]

Need a bit of help, we've developed a problem with our e-mail flow...

 

Our setup is that incoming external mail comes in via our old exchange 2003 server and forwards it to our exchange 2010 server, the outgoing mail goes straight out via the 2010 server.

 

For some reason e-mails are now stuck an queueing on the 2003 server in the "Messages awaiting directory lookup" queue, there is no obvious reason, nothing shows up in the logs that explains why, I've stopped and restarted everything I can think of on the servers but nothing seems to solve the problem.

 

I would appreciate any advice on how to further troubleshoot this - or fix it..

 

Thanks in advance

 

D

Edited January 14, 2016 by bert113