mdaemon中如何禁止空发件人发入邮件

frameboy

看了一下smtpin的日值，发现里面有大量的垃圾连接，只有ip，没有发件人地址：

Tue 2007-11-06 18:59:21: Session 8245; child 8; thread 1192
Tue 2007-11-06 18:59:20: 接收 SMTP 来自[64.191.197.51 : 3686]的连接
Tue 2007-11-06 18:59:20: --> 220 ahtech.com.cn ESMTP MDaemon 8.0.2; Tue, 06 Nov 2007 18:59:20 +0800
Tue 2007-11-06 18:59:20: <-- EHLO mail.atomz.com
Tue 2007-11-06 18:59:20: --> 250-aa.com.cn Hello mail.atomz.com, 很高兴见到你
Tue 2007-11-06 18:59:20: --> 250-ETRN
Tue 2007-11-06 18:59:20: --> 250-AUTH=LOGIN
Tue 2007-11-06 18:59:20: --> 250-AUTH LOGIN CRAM-MD5
Tue 2007-11-06 18:59:20: --> 250-8BITMIME
Tue 2007-11-06 18:59:20: --> 250 SIZE 0
Tue 2007-11-06 18:59:21: <-- MAIL FROM:<> SIZE=2468
Tue 2007-11-06 18:59:21: --> 250 <> , 发信人完成。
Tue 2007-11-06 18:59:21: <-- RCPT TO:<rex6samtaney20@aa.com.cn>
Tue 2007-11-06 18:59:21: 发信人试图传递邮件到未知地址
Tue 2007-11-06 18:59:21: --> 550 <rex6samtaney20@aa.com.cn>, 收信人未知。
Tue 2007-11-06 18:59:21: <-- RSET
Tue 2007-11-06 18:59:21: --> 250 重设? 行, 好。
Tue 2007-11-06 18:59:21: <-- QUIT
Tue 2007-11-06 18:59:21: --> 221 下回见
Tue 2007-11-06 18:59:21: SMTP 连接成功完成(字节入/出: 97/308)
Tue 2007-11-06 18:59:21: ----------

请问mdaemon中如何设置系统自动拒绝连接这种垃圾？