Maildrop
From Qmail Info Wiki
maildrop is a mail filtering and local delivery program, similar to procmail. It was written by Sam Varshavchik, author of courier-imap, and is the mail filtering and delivery portion of his Courier Mail Server (http://www.courier-mta.org/), broken out as a separate package.
The maildrop package includes the reformime program, which is used by qmail-scanner to work with MIME-encapsulated messages.
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Links
Home page for maildrop (http://www.courier-mta.org/maildrop/)
