Anyone already implement this with postfix?

Renattach is a small, efficient and surprisingly effective filter designed
primarily to offer an additional level of safety to Windows users whose
e-mails pass through a UNIX-like mail server. Many modern viruses are
spread through e-mail, and renattach combats such viruses by filtering
e-mail attachments based on file extension. In version 1.1.1, the MIME
type is also renamed. The idea is to rename potentially dangerous
attachments (executable ones) so that the user, or the user's poorly
written e-mail software, does not accidentally execute the attachment.
Also see Project page on freshmeat.

renattach has been tested on linux, Solaris and other UNIX'es. It works
with sendmail, qmail, and postfix and probably any other MTA. For
instance, The Medical University of South Carolina uses renattach on a
UNIX IMAP server which supports over 10,000 users!

-- 
A. Yahya Sjarifuddin
http://www.cbn.net.id
--
Actresses will happen in the best regulated families.
		-- Addison Mizner and Oliver Herford, "The Entirely
		New Cynic's Calendar", 1905
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