warning: non-SMTP command from unknown

色んなことする奴がいる

Jul  7 17:01:21 MAIL1 postfix/smtpd[21719]: warning: 182.118.53.124: hostname hn.kd.ny.adsl verification failed: Name or service not known
Jul  7 17:01:21 MAIL1 postfix/smtpd[21719]: connect from unknown[182.118.53.124]
Jul  7 17:01:21 MAIL1 postfix/smtpd[21719]: warning: non-SMTP command from unknown[182.118.53.124]: GET / HTTP/1.0
Jul  7 17:01:21 MAIL1 postfix/smtpd[21719]: disconnect from unknown[182.118.53.124]

Jul  8 15:37:34 MAIL1 postfix/smtpd[22550]: connect from unknown[198.144.145.29]
Jul  8 15:37:34 MAIL1 postfix/smtpd[22550]: warning: non-SMTP command from unknown[198.144.145.29]: Date: Wed, 8 Jul 2015 02:37:13 -0400 (EDT)
Jul  8 15:37:34 MAIL1 postfix/smtpd[22550]: disconnect from unknown[198.144.145.29]

warning: non-SMTP command from unknownは、main.cfのsmtpd_forbidden_commandsで指定された通常無効なコマンドを受け取った時に吐かれるログ。主に踏み台にできるか確認しているらしい。。。

Jul  8 10:53:34 MAIL1 postfix/smtpd[12652]: connect from unknown[67.19.79.218]
Jul  8 10:53:34 MAIL1 postfix/smtpd[12652]: lost connection after CONNECT from unknown[67.19.79.218]
Jul  8 10:53:34 MAIL1 postfix/smtpd[12652]: disconnect from unknown[67.19.79.218]

lost connection after CONNECT from unknownはquitでないコマンドで切断された時のログ。