We have been using email enabled document libraries sucessfully for a couple years but recently noticed a few libraries are no longer receiving the messages even though they are still email enabled. This only affects a few libraries and others within the site work fine. Simply disabling email and reenabling fixes the problem with the broken libraries.
The failed messages will appear momentarily in the IIS SMTP Drop folder as normal but nothing arrives in the document library until I disable and then enable the library for email again.
I found the following blog on msdn.com that appears to be my problem but hesitate to run the command they note without getting confirmation this is a harmless command that will not introduce problems. The command in question is "stsadm -o refreshdms -url <web application url>".
It would be nice to fix the problem but can certainly use the workarouind above for the time being. Any help is appreciated.