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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

Comments

4 comments

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  • Avatar
    Jürgen Tenckhoff

    Error:

    postfix/master[24695]: /etc/postfix/master.cf: line 124: using backwards-compatible default setting chroot=y
    postfix/master[24695]: /etc/postfix/master.cf: line 126: using backwards-compatible default setting chroot=y

     

    If activating  "COMPATIBILITY_LEVEL = 2" as recommended I can not any longer send E-Mails. How can I solve this

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  • Avatar
    Alisa Kasyanova

    @Jürgen Tenckhoff
    Check this article as well: https://support.plesk.com/hc/en-us/articles/360004930633-Unable-to-send-an-email-from-Plesk-server-SMTP-Error-535-Authentication-failed

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  • Avatar
    Gilberto (Edited )

    Can it crash the postfix?

    Postfix was at 02.10.2020 uptoated

    # grep postfix yum.log-20201007
    Oct 02 11:33:02 Updated: 2:postfix-3.5.6-2.centos.7+p18.0.30.0+t200826.0942.x86_64 

    and yesterday the postfix crashed

     

    # /var/log/messages

    Oct 7 11:28:55 sh02 postfix[8665]: Postfix is running with backwards-compatible default settings
    Oct 7 11:28:55 sh02 postfix[8665]: See http://www.postfix.org/COMPATIBILITY_README.html for details
    Oct 7 11:28:55 sh02 postfix[8665]: To disable backwards compatibility use "postconf compatibility_level=2" and "postfix reload"
    Oct 7 11:28:55 sh02 postfix/postfix-script[8671]: stopping the Postfix mail system
    Oct 7 11:28:55 sh02 postfix/master[717]: terminating on signal 15

     

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  • Avatar
    Anton Maslov

    Hello, "terminating on signal 15" means just regular Postfix stop with for example "service postfix stop" or "service postfix restart" command. Also, please note that Postfix can be restarted in case any changes to its configuration performed, so most likely it was just regular restart as a result of some settings being changed.

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