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