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

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Ekaterina Babenko
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Plesk Onyx for Linux kb: technical Plesk Obsidian for Linux

Applicable to:

  • Plesk Obsidian for Linux
  • Plesk Onyx for Linux

Symptoms

  • In Tools & Settings > Mail Server Settings Postfix is set up as SMTP server:
    mceclip0.png
  • Notifications which are set up in Plesk in Tools & Settings > Notifications are not sent.

  • 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"

  • Postfix was installed on server before Plesk installation; 
  • When connected server via SSH the configuration file like /etc/postfix/main.cf.rpmnew can be found. This file indicates that configuration files were modified before Plesk installation. 

Cause

Postfix is running in the backward-compatible mode: on upgrade package manager backed up modified configuration files where backward-compatible mode was disabled and created new clean one.

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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