how to troubleshoot message tracking sttuck at categorizer

[wallst32]

I have an internal domain I forward mail to from my Exchange server. For example, I have the mycompany.com and int.mycompany.com domains. int.mycompany.com is created in my internal DNS with an MX host and accepts SMTP.

E-mails have been forwarding from the mycompany.com Exchange server to the int.mycompany.com mail server. All of a sudden today, mails are no longer flowing. If I view the history in message tracking, each message gets to "SMTP: Message Submitted to Categorizer" and hangs there.

When it works, the next step would be "SMTP outbound". But it is not getting to this point. I did nslookup on the exchange server and it can resolve the int domain and mx.

Any ideas?

TIA

 

[icvanstra]

TIA, is this _all_ mail or only some mail?

If some: is it to a distribution group? If so are you a multidomain environment?

thanks,
eric