attachment extention filter

I'm looking to implement a (crude?) attachment filter.  So far, I've been
matching with something like this for file extensions:

:0 H
*^Content-type: (multipart/mixed)
{
        :0 B
        *^Content-Disposition: (attachment|inline)
        *filename=".*\.tar\.gz"
        /path/to/Maildir/
}

I'm not actually blocking .tar.gz's, but I'd like to block files with
double extensions of .pif, .com, etc...

I feel like I'm missing some attachments - are

*^Content-type: (multipart/mixed) &&
*^Content-Disposition: (attachment|inline)

enough, or can attachments slide past in additional ways?  Would it be
worth the pain of chewing through an RFC for this?

Any suggestions are appreaciated in advance.

-Mark

-- 
> --))> >--))>
Mark T. Valites
Unix Systems Analyst
1 College Circle - 124b1 South Hall
SUNY Geneseo
Geneseo, NY 14454
585-245-5577
585-259-3471 (Cell)
585-245-5579 (Fax)


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