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TMDA (Tagged Message Delivery Agent) is an anti-spam tool similar to oSpam (see the "oSpam" section in this appendix). TMDA allows the user to maintain a whitelist, a list of pre-approved senders. Messages from all other senders are held until the sender responds to a confirmation request. Because most spammers use invalid return addresses or are too lazy to respond to confirmation requests, their messages are not delivered.
TMDA is covered in Chapter 8, "Controlling Junk Mail."
TMDA was written by Jason Mastaler, who maintains a Web page for it (http://software.libertine.org/tmda/).
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