I don't have any new information to add, but I'd like to chime in about the location of the SMTP logs.
As said before, you need to enable Diagnostic Logging in the IMC section of the Exchange Administrator.
I have the following options set to minimal: Message Transfer, SMTP Interface Events...
I'm by no means an Exchange Guru, and this isn't exactly scientific, but I thought I'd post it anyway, in case it helps anyone...
Yesterday I had to reboot our server because of the new NT patches. Before I rebooted I stopped the IMS and moved all of the IMC log files and route.txt file into...
We too are experiencing this problem... It started a few months ago, the only common thread I could find was that the messages had attachments over 30k. The funny thing is, I can send large plain text email to the same user/domain and it goes through... After banging my head against the wall...
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