551 This mail server requires authentication before sending mail from a locally hosted domain

Created:

2016-11-16 13:19:18 UTC

Modified:

2017-04-24 11:15:51 UTC

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551 This mail server requires authentication before sending mail from a locally hosted domain

Applicable to:

  • Plesk for Windows
  • Plesk 12.5 for Linux
  • Plesk Onyx for Linux

Symptoms

For example.com domain hosted on a Plesk server, emails sent from mailbox1@example.com to mailbox2@example.com are rejected with the following error:

551 This mail server requires authentication before sending mail from a locally hosted domain. Please reconfigure your mail client to authenticate before sending mail.

Cause

This error means that a server or client has connected to the SMTP service to send email, using a sender address domain which exists on the mail server, but has not authenticated.

Resolution

In order to fix the issue, please, follow the steps mentioned in the KB article below:

http://www.mailenable.com/kb/Content/Article.asp?ID=me020032&SS=

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