mdaeon smtp-in记录中mail from:<>处理规则

七彩旭日

mdaemon  smtp_in的日志发现垃圾邮件连接时 mail from：<>为空(但用户收到邮件时却又有发件人地址）如何拒绝这样的垃圾邮件？

具体日志如下:
Thu 2015-12-24 01:10:29: Session 9991; child 1; thread 3904
Thu 2015-12-24 01:10:24: Accepting SMTP connection from [177.44.112.95 : 4685]
Thu 2015-12-24 01:10:24: --> 220 Microsoft ESMTP MAIL Service ready
Thu 2015-12-24 01:10:25: <-- HELO 177.44.112.95
Thu 2015-12-24 01:10:25: --> 250 xxx.com     Hello 177.44.112.95, pleased to meet you

MAIL FROM:<>
Thu 2015-12-24 01:10:26: Performing PTR lookup (95.112.44.177.IN-ADDR.ARPA)
Thu 2015-12-24 01:10:26: *  D=95.112.44.177.IN-ADDR.ARPA TTL=(1434) PTR=[177-44-112-95.uni.mastercabo.com.br]
Thu 2015-12-24 01:10:26: *  Gathering A records...
Thu 2015-12-24 01:10:26: *  D=177-44-112-95.uni.mastercabo.com.br TTL=(1) A=[218.93.250.18]
Thu 2015-12-24 01:10:26: ---- End PTR results
Thu 2015-12-24 01:10:26: --> 250 <>, Sender ok

我在mdaemon 建立的规则但发现规则没有执行，有这方面经验的人吗？