Unable to relay mail. 550 5.7.1 Unable to relay for john@example.com

Created:

2016-11-16 12:53:25 UTC

Modified:

2017-04-24 11:21:35 UTC

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Unable to relay mail. 550 5.7.1 Unable to relay for john@example.com

Applicable to:

  • Plesk 11.0 for Linux
  • Plesk 11.5 for Linux
  • Plesk 12.0 for Linux

Symptoms

Emails are not delivered to recepient. The following error is found in Mailenable SMTP log:

  SMTP error from remote mail server after RCPT TO:<sltest@domain.com>:
host mail.domain.com [1.1.1.1]: 550 5.7.1 Unable to relay for john@example.com

Cause

Incorrect submission port

Resolution

Reconfigure the Mailenable SMTP settings:

SMTP -> Properties -> "Inbound" tab -> "Port Settings" Settings

Set:

SMTP port = 25
Submission port = 587
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