软件包：milter-greylist（4.6.4-3 以及其他的） [debports]
Greylist milter for sendmail
milter-greylist is a stand-alone milter written in C that implements the greylist filtering method, as proposed by Evan Harris.
Greylisting works by assuming that unlike legitimate MTA, spam engines will not retry sending their junk mail on a temporary error. The filter will always temporarily reject mail on a first attempt, and to accept it after some time has elapsed.
If spammers ever try to resend rejected messages, we can assume they will not stay idle between the two sends (if they do, the spam problem would just be solved). Odds are good that the spammer will send a mail to an honey pot address and get blacklisted in several real-time distributed black list before the second attempt.
其他与 milter-greylist 有关的软件包
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- dep: adduser (>= 3.11)
- 添加、删除用户和组
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- dep: init-system-helpers (>= 1.51)
- 所有初始化系统的帮助工具
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- dep: libc6 (>= 2.34)
- GNU C 语言运行库：共享库
同时作为一个虚包由这些包填实： libc6-udeb
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- dep: libcurl4t64 (>= 7.16.2)
- 简单易用的客户端 URL 传输软件库（OpenSSL 变种）
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- dep: libmilter1.0.1
- Sendmail Mail Filter API (Milter)
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- dep: libopendkim11 (>= 2.11.0~alpha)
- DomainKeys Identified Mail (DKIM) library
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- dep: libspf2-2t64
- library for validating mail senders with SPF