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sendmail が collect: premature EOM: unexpected close メッセージを出力する

Solution Verified - Updated -

Issue

  • smtp クライアントが一部のメールを送信しません。受信ホストの /var/log/maillog を確認すると以下のようなメッセージが出力されていました。

    • パターン 1
    May 24 11:41:36 hostname sendmail[2706]: o4O2aLvc002706: collect: premature EOM: unexpected close
    May 24 11:41:36 hostname sendmail[2706]: o4O2aLvc002706: collect: unexpected close on connection from [10.xx.xxx.x], sender=<*********@**.****.co.jp>
    
    • パターン 2
    Feb 26 08:32:53 hostname sendmail[18713]: o1PNNejK018713: collect: premature EOM:Connection reset by [10.xx.xxx.xxx]
    Feb 26 08:32:53 hostname sendmail[18713]: o1PNNejK018713:SYSERR(root): collect:I/O error on connection from [10.xx.xxx.xxx], from=<xxxx@xxx.xxx.xxx.com>
    

Environment

  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • sendmail

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