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postfix で 554 5.7.1 : Relay access denied エラーが発生する

Solution Verified - Updated -

Issue

  • MX サーバーで Postfix を実行しています。システムでメールが配信されていますが、リモートドメインに向かわず、以下のエラーが発生します。
Nov 26 08:33:54 smtp3 postfix/smtpd[27945]:NOQUEUE: reject:RCPT from d04-o33.htest.com[xx.xx.xx.xx]:554 5.7.1 <user@domain.com>:Relay access denied; from=<user1@htest.com> to=<user@domain.com> proto=ESMTP helo=<D04-O33.htest.com>)

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Postfix

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