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NDRs for incoming mail

Sometimes our Exchange 2003 server issues NDRs for incoming mail. Unfortunately the NDR doesn't give any information for the failure. Message tracking likewise does not give any useful information. Example below. Any idea why incoming mail like that would fail?

NDR in Outlook:
This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.

Exchange Message Tracking:
1/8/2013 2:57 PM SMTP: Message Submitted to Advanced Queuing
1/8/2013 2:57 PM SMTP: Started Message Submission to Advanced Queue
1/8/2013 2:57 PM SMTP: Message Submitted to Categorizer
1/8/2013 2:57 PM SMTP: Message Categorized and Queued for Routing
1/8/2013 2:57 PM SMTP: Non-Delivery Report (NDR) Generated
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ChrisEDavis
Asked:
ChrisEDavis
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1 Solution
 
mcsweenSr. Network AdministratorCommented:
Was there a code next to the recipient that was sanitized from the error?

Can you please re-post the error and just change the email address to noone@nowhere.com
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Paul MacDonaldDirector, Information SystemsCommented:
Are these valid recipients?
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ChrisEDavisAuthor Commented:
Yes they are valid recipients (the mail addresses are correct). But there was no error code. So I'm at a loss how to find the problem. Only happens occasionally, but enough to annoy our users.

This is all it says:
This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.

       correctrecipient@ourdomain.com
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Paul MacDonaldDirector, Information SystemsCommented:
Is it possible an administrator is clearing items from the queue by deleting them with an NDR?  If it's intermittent and they're valid addresses, that's the only explaination I could come up with.
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ChrisEDavisAuthor Commented:
Thanks for the post but, no I am the admin and I haven't cleared any.
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ChrisEDavisAuthor Commented:
We use AVG antivirus. Could it be that AVG stopped the mail before it got to Outlook. Not sure if that would stopped the server from delivering it?
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Paul MacDonaldDirector, Information SystemsCommented:
I don't see any antivirus generating an NDR.  This is mail from one employee to another?  Not mail coming from outside to an employee?
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ChrisEDavisAuthor Commented:
No this is mail coming from outside to an employee. He is getting all other mail from that sender OK ... before and after that e-mail. But for some reason that particular e-mail was not delivered. That's what made me think it may have been stopped by the AV. It didn't reach Outlook so is not in his Junk folder. In fact he did not get it on his cell phone or tablet either. Also it did not make it to the archive ... all mail at our place is delivered to an archive by Exchange.

I have asked them to please resend the same e-mail again. I'd like to see if it is stopped again.
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Paul MacDonaldDirector, Information SystemsCommented:
So...just one e-mail?  

It might be Exchange couldn't resolve the user as valid for some reason. Maybe his mailbox database was busy, or someone was mucking about with the user's account in AD or something.  But if it was just one e-mail, I wouldn't worry about it.
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