由于前几天我已经看到从localhost每隔几分钟左右经常SMTP连接检查/ var / log / exim_mainlog
2015-05-08 13:34:41 SMTP connection from [127.0.0.1]:48724 (TCP/IP connection count = 1) 2015-05-08 13:34:42 SMTP connection from localhost [127.0.0.1]:48724 closed by QUIT 2015-05-08 13:35:29 cwd=/etc/csf 2 args: /usr/sbin/exim -bpc 2015-05-08 13:39:44 SMTP connection from [127.0.0.1]:48748 (TCP/IP connection count = 1) 2015-05-08 13:39:45 SMTP connection from localhost [127.0.0.1]:48748 closed by QUIT 2015-05-08 13:40:29 cwd=/etc/csf 2 args: /usr/sbin/exim -bpc 2015-05-08 13:44:48 SMTP connection from [127.0.0.1]:48774 (TCP/IP connection count = 1) 2015-05-08 13:44:49 SMTP connection from localhost [127.0.0.1]:48774 closed by QUIT 2015-05-08 13:45:29 cwd=/etc/csf 2 args: /usr/sbin/exim -bpc 2015-05-08 13:49:50 SMTP connection from [127.0.0.1]:48800 (TCP/IP connection count = 1) 2015-05-08 13:49:51 SMTP connection from localhost [127.0.0.1]:48800 closed by QUIT 2015-05-08 13:50:29 cwd=/etc/csf 2 args: /usr/sbin/exim -bpc 似乎一个连接开始，然后停止一秒钟后。 任何人都知道是什么原因造成的 谢谢。
考虑到规则性（5分钟）以及与exim -bpc调用（它检查邮件队列状态）的相关性，我的猜测是它会是某种监视探测器（nagios插件，或者类似的东西），检查你的SMTPd是健康的。