MIMEDefang can inspect and modify e-mail messages as they pass through your mail relay. MIMEDefang is written in Perl, and its filter actions are expressed in Perl, so it's highly flexible. Delete or alter attachments based on file name, contents, results of a virus scan, and attachment size. Replace large attachments with links to a centrally-stored copy to ease the burden on POP3 users with slow modem links. Add boilerplate text to e-mail messages. Customize filter rules based on domain, user-name, and relay machine. Reject unacceptable messages, where you define what "unacceptable" means. Add or delete recipients for a message.
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