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The Tagged Message Delivery Agent (TMDA) thwarts incoming junk-mail by maintaining a "whitelist" of trusted contacts who are allowed directly into your mailbox. It holds messages from unknown senders in a pending queue until they respond to a confirmation request sent by TMDA. Once they respond to the confirmation, their original message is deemed legitimate and is delivered to you. Updating your whitelist insures they won't have to confirm future messages. TMDA can even be configured to automatically whitelist confirmed senders. This method is very selective about what it allows in while still letting legitimate, but previously unknown, senders reach you. It also acts as a local mail delivery agent whose filtering language gives you fine-grained control over how mail is delivered and sent. This method is very selective about what it allows in while still letting legitimate, but previously unknown, senders reach you. TMDA currently supports qmail, Postfix, Exim, Courier, and Sendmail.


Download version 1.1.12 (stable)
released on 30 July 2007

VCS Checkout


Related Projects


LicenseVerified byVerified onNotes
GPLv2orlaterJanet Casey1 August 2002

Leaders and contributors

Jason R. Mastaler Maintainer
See the THANKS file in the distribution for a complete list Contributor

Resources and communication

Audience Resource type URI
Developer VCS Repository Webview
Help E-mail
Support E-mail
Bug Tracking,Developer E-mail

Software prerequisites

Kind Description
Required to use Python (author recommends 2.2 or later)
Weak prerequisite procmail (if sendmail is your MTA)
Weak prerequisite an SMTP server (aka a mail transport agent)

This entry (in part or in whole) was last reviewed on 11 January 2017.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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