I think I understand the question.
I only get banned extension notices when there is no known virus.
I route these banned notices to a folder in my mail program for special
attention (the virus name is in the subject).
The banned e-mails get checked "by hand".
If it looks legit, I send a form letter to the source and destination.
("... for your protection we are blocking ."
The others are assumed to be either a new virus (first few hours) or a
broken scrap returned by another mail system.
Greg
PS I'll revive a long term request.
When I try to guess if a banned e-mail is legit, the FULL file name and
not just the extension would be a BIG help.
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