我只是添加域密钥到我的sendmailconfiguration，一切似乎工作。 然而，在回顾maillog时，我收到了一大堆这样的邮件：
Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue Oct 4 09:42:44 servername sendmail[22036]: q94GgiGB022036: milter=dkim-filter, action=header, continue 任何线索可能是什么原因造成的？ 这不是一个很大的问题，但是我宁愿每次发送一封邮件时都没有那么多行。
dkim-filter有一个-l选项。 如果你忽略这个说法，这些日志行将会消失。
另一个可能的方法是安装syslog-ng并使用过滤指令，您可以在logging之前删除行。 （我喜欢后者，因为您可以删除其他程序无意义的输出。）