关于sendmail日志的几条信息的追踪与理解

liyis永恒

1. May  3 13:49:43 erxx sendmail[22471]: p435nhYA022471: erxx.sanxx.com [61.147.67.229] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
   
2. May  3 13:52:43 erxx sendmail[22747]: p435qhKe022747: erxx.sanxx.com [61.147.67.229] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
   
3. May  3 13:55:06 erxx dovecot: pop3-login: Aborted login: rip=::ffff:61.147.67.230, lip=::ffff:61.129.67.229
   
4. May  3 13:55:26 erxx dovecot: imap-login: Aborted login: rip=::ffff:61.147.67.230, lip=::ffff:61.129.67.229
   
5. May  3 13:55:43 erxxi sendmail[23022]: p435thDs023022: erxx.sanxx.com [61.147.67.229] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
   
6. May  3 13:58:43 erxx sendmail[23291]: p435whtb023291: erxxi.sanxx.com [61.147.67.229] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
   
7. May  3 14:01:43 erxx sendmail[23571]: p4361hW6023571: erxx.sanxx.com [61.147.67.229] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA

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开门见山。以上是我的sendmail日志部分截取。到网上找了很多资料。均不见很好的回答与解释。
本人不太懂这几句话的意思。请各位帮忙分析下。

环境：2台服务器：erxx  / sanxx。 sanxx可以通过erxx转发发送邮件。
①邮件服务器 erxx 。配置了转发与认证。sanxx也可以正常通过其发件。 IP:61.147.67.229           
erxx host文件：

1. 
   
2. 127.0.0.1               localhost.localdomain localhost
   
3. 61.147.67.229           erxx.sanxx.com
   
4. 61.147.67.230           sanxx.sanxx.com
   
5. ::1             localhost6.localdomain6 localhost6
   

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hostname: erxx.sanxx.com

② 应用服务器 sanxx。通过erxx往外网发送邮件。  IP:61.147.67.230   

sanxx host 文件：

1. 
   
2. 127.0.0.1               localhost.localdomain localhost
   
3. ::1             localhost6.localdomain6 localhost6
   
4. 61.147.67.229           erxx.sanxx.com
   
5. 61.147.67.230           sanxx.sanxx.com
   

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hostname: sanxx.sanxx.com

症状：发信一切正常。但是日志重复出现以上信息。就是想明白那究竟是何意思。并解决掉。
上周这台邮件服务器由于操作失误，被利用发送垃圾邮件。但是现在各大邮件服务商均可以收到我们的邮件。

liyis永恒

any one?