Unable to receive emails: 550 5.7.1 Unable to relay

Created:

2016-11-16 12:44:31 UTC

Modified:

2017-04-24 12:13:24 UTC

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Unable to receive emails: 550 5.7.1 Unable to relay

Applicable to:

  • Plesk 12.5 for Windows

Symptoms

Unable to receive emails. The following bounce back message is received:

550 5.7.1 Unable to relay for mail@example.com

The following errors can be found in %plesk_dir%Mail Servers\\Mail Enable\\Logging\\SMTP\\SMTP-Debug-160930.log :

Could not start service. Check that another service is not running or security software has not prevented access to the port

Cause

Simple Mail Transfer Protocol service is listening to TCP port 25

Resolution

  1. Stop Simple Mail Transfer Protocol service usig servies.msc console.

  2. Restart MailEnable services via Plesk Monitor.

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