Mail bounced due to "host relayserver[xx.xx.xx.xx] said: 503 5.5.1 Error: need MAIL command - MAIL FROM error: 451 4.7.1 Service unavailable - try again later (in reply to RCPT TO command)" message.

Solution In Progress - Updated -

Issue

  • Mail bounced due to "host relayserver[xx.xx.xx.xx] said: 503 5.5.1 Error: need MAIL command - MAIL FROM error: 451 4.7.1 Service unavailable - try again later (in reply to RCPT TO command)" message.

Environment

  • Red Hat Enterprise Linux 7
  • postfix

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