MIMEDefang is a flexible MIME email scanner designed to
protect Windows clients from viruses. Includes the ability to do
many other kinds of mail processing, such as replacing parts of
messages with URLs. It can alter or delete various parts of a MIME
message according to a very flexible configuration file. It can
also bounce messages with unacceptable attachments. MIMEDefang
works with the Sendmail 8.11 and newer "Milter" API, which makes it
more flexible and efficient than procmail-based approaches.
Read more https://packetstormsecurity.com/files/172048/mimedefang-3.4.tar.gz