Re: [chat]Anti-spam的想法
※ 引述《sheng.bbs@bbs.ykvs.tpc.edu.tw (天涯明月心)》之銘言：
> ※ 引述《Seeyou@bbs.ee.ntu.edu.tw (我愛 TX)》之銘言：
> : 使用者可以自行設定允許接受的來源信件
> : 寄件者的e-mail 不是我的好友，我根本不接受寄來的信，由sendmail 立即擋下
> : 想加入我的好友，需先經過我的認證才行
> : 譬如說寄出一封標題為[請認証]的信件，這種信就可以過關
> : 而這個[請認証]的字樣還可以由使用者自行更改，應該夠靈活了
> : 有點異想天開，不過應該可行
> : 只是有那種 mail server 已經實作了嗎?
> http://www.0spam.com/
> 不知道那裡有類似的，可以下載來安裝。
/usr/ports/mail/tmda
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.
Author: Jason R. Mastaler
WWW: http://tmda.net/
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※ Origin: 邪惡小鹿鹿 <Deer.twbbs.org> ◆ From: muse.csie.ntu.edu.tw
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