推荐一下,我感觉这个还比较好用.

针对BBS上的垃圾邮件,这个软件可以及时反馈系统接受垃圾信件的数量.
超过一定数量后,能够及时拦截.封禁email地址.用于Sendmail,qmail, postfix等


http://www.enderunix.org/spamguard/

What is spamGuard?

Nearly all of today's mail system administrators face spam as their first threat. Because of this, EnderUNIX team has written a small application to automagically monitor malicious spammer activity in your mail server logs. spamGuard is written purely
to stop spammers hanging around. For the time being, the program supports qmail MTA with multilog, syslog , sendmail and postfix
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FROM bbs.tju.edu.cn