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Plesk notifications are not sent: Postfix is running with backwards-compatible default settings

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Taras Ermoshin
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Applicable to:

  • Plesk Onyx for Linux

Symptoms

  • Notifications which are set up in Plesk in Tools & Settings > Notifications are not sent.

  • When a notification should be sent, Postfix service is terminated with the signal 15 and restarted.

  • The following records can be found in the file /var/log/maillog:

    CONFIG_TEXT: postfix[54992]: Postfix is running with backward-compatible default settings
    ...
    plesk postfix/master[32815]: terminating on signal 15
    plesk postfix[55085]: Postfix is running with backwards-compatible default settings
    plesk postfix[55085]: See http://www.postfix.org/COMPATIBILITY_README.html for details
    plesk postfix[55085]: To disable backwards compatibility use "postconf compatibility_level=2" and "postfix reload"
    plesk postfix/master[55122]: /etc/postfix/master.cf: line 123: using backwards-compatible default setting chroot=y
    plesk postfix/master[55122]: /etc/postfix/master.cf: line 125: using backwards-compatible default setting chroot=y
    plesk postfix/master[55122]: daemon started -- version 3.1.0, configuration /etc/postfix

Cause

Postfix is running in the backward-compatible mode.

Resolution

Note: This article is intended for use by server administrators. In case there is no administrative SSH access to the server, contact the server administrator or server provider.

  1. Connect to the server using SSH.

  2. Add the following line to the file /etc/postfix/main.cf:

    CONFIG_TEXT: compatibility_level=2

  3. Reload Postfix configuration:

    # service postfix reload

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