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Tagged Message Delivery Agent (TMDA) is designed to significantly reduce the
amount of spam (junk-mail) you receive. TMDA strives to be more effective,
yet less time-consuming than traditional spam filters.
The technical countermeasures used by TMDA to thwart spam include:
- whitelists: accept mail from known, trusted senders
- blacklists: refuse mail from undesired senders
- challenge/response: allows unknown senders which aren't on the whitelist or
blacklist the chance to confirm that their message is legitimate (non-spam)
- tagged addresses: special-purpose e-mail addresses such as time-dependent
addresses, or addresses which only accept certain kinds of communication.
These increase the transparency of TMDA for unknown senders by allowing them
to safely circumvent the challenge/response system.
TMDA can also be used as a general purpose local mail delivery agent to filter,
sort, deliver and dispose of incoming mail.
WWW: http://tmda.net/
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