> I was just thinking the same thing, that strictly going by 
> file name would not be best.

Well at least it would be ressource friendly.

Some thoughts:
Count attached file names but

1)ignore extensions like gif, jpg, pdf, ...
  or alternatively look only for known risky extensions like zip, exe,
com...
2)ignore files that are below x and above y of file size
3)ignore messages comming from certain sources
  (this whitelist can be adapted after finding a false positive)

As I can immagine this tool should work in the background and block messages
only durring a new outbreak. (if it will work like we want)
So it can/should also send a mail alert to the admin so that he immediately
can keep an eye on whats going on there.

Markus

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