Exchange Internal external email not being delivered or recieved


For the last 4 hours we have had a issue with our external and internal email which is not being delivered.
When we look at the tracking for all the messages sent the message ends by being submitted to the categorizor and goes no further. Our awaiting directory lookup folder is now in excess of 500.
Wew are running exchange  2003 with Trend micro. We have tried a few solutions found on the web but no luck yet.
Any help apreicated.

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Have you checked you domain controllers to make sure that they are all still functioning?  Try running a dcdiag from the command prompt on your domain controller and verify that all test come back as passed.  you may also want to try running a netdiag from your domain controller and exchange server/

You may have to install netdiag from here 

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jdthedjAuthor Commented:

Thanks for your help. We have started recieving emails again.
Can the emails that are in that awaiting directory lookup folder being fowarded or sent still??
jdthedjAuthor Commented:
We checked all those and it is now fixed.

They should automatically start flowing but it may take a little while.  If not just post back
jdthedjAuthor Commented:
Thanks - yes they have started flowing again.
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