# mail,logを1台で動かす場合
<source>
  type tail
  path /var/log/maillog
  tag maillog
  format /^(?<date>[^ ]+) (?<host>[^ ]+) (?<process>[^:]+): (?<message>((?<key>[^ :]+)[ :])? ?((to|from)=<(?<address>[^>]+)>)?.*)$/
  pos_file /var/log/td-agent/mail.pos
</source>

<match maillog>
  type file
  path /var/log/td-agent/mail_log
</match>