From: Mike N. 

On Sat, 6 Mar 2004 09:42:56 -0500, "Geo."  wrote:

>So I came up with a way to just block encrypted zip files,
>turns out the 10th character in the attachment is a "Q" if
it's encrypted so
>I build a filter to look for that. 2 days later it's not working anymore

  If you de-mime the zip file, you can inspect the file names.  A trailing
'+' indicates an encrypted file.   This can easily be thwarted by double
zipping and having people click twice.

  We ended up with a number legit encrypted zip file users.  I don't have a
real good solution yet.

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