Getting "554 5.7.1 : Relay access denied" error in Postfix.

Solution Verified - Updated -

Issue

  • Postfix is running on MX server. Mails are delivering on the system but not going to remote destination and getting following error:
Nov 26 08:33:54 smtp3 postfix/smtpd[27945]: NOQUEUE: reject: RCPT from d04-o33.example.com[xx.xx.xx.xx]: 554 5.7.1 <user@domain.com>: Relay access denied; from=<user1@example.com> to=<user@domain.com> proto=ESMTP helo=<D04-O33.example.com>)

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Postfix

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