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-MIMEDefang is an e-mail filter program which works with Sendmail 8.12
-and later. MIMEDefang filters all e-mail messages sent via SMTP.
-MIMEDefang splits multi-part MIME messages into their components and
-potentially deletes or modifies the various parts. It then
-reassembles the parts back into an e-mail message and sends it on its
-way.
-
-MIMEDefang is written (mostly) in Perl, and the filter actions are
-expressed in Perl. This makes MIMEDefang highly flexible and
-configurable. As a simple example, you can delete all *.exe and *.com
-files, convert all Word documents to HTML, and allow other attachments
-through.
-
-MIMEDefang uses the "milter" feature of Sendmail to "listen in" to
-SMTP connections. It runs a scan once for each message, not once for
-each recipient (as simpler procmail-based systems do.) Therefore, it
-is more CPU-friendly than procmail-based systems. In addition,
-because MIMEDefang can participate in the SMTP connection, you can
-bounce messages (something impossible to do with procmail-based
-systems.)