maildrop – mail delivery agent with filtering abilities

Last Updated on July 11, 2021

maildrop is a replacement local mail delivery agent that includes a mail filtering language. The system administrator can either replace the existing mail delivery agent with maildrop, or users may run maildrop using the ‘forward to program’ mechanism of the existing mail delivery agent.

maildrop first reads the e-mail message on standard input. Trailing carriage return characters are automatically stripped. An e-mail message consists of header lines, followed by a blank line, followed by the contents of the message. The message may contain an mbox-style From_ line before the first header line. If the message does not contain a From_ line, maildrop will create one (if needed).

This mail filter module is included in the Courier mail server, which uses it to filter incoming mail. Maildrop is also provided as a separate package that can be used with other mail servers as well.

Features include:

  • Supports mbox-style mailboxes and maildirs.
  • Mail filtering language supports RFC822 parsing and GDBM/Berkeley DB database files.

Website: www.courier-mta.org/maildrop
Support: Documentation
Developer: Helge Heß and many others
License: GNU GPL or LGPL

maildrop is written in C++. Learn C++ with our recommended free books and free tutorials.

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