Article ID: 124611, created on Feb 26, 2015, last review on Feb 26, 2015

  • Applies to:
  • Plesk 12.0 for Linux
  • Plesk 11.0 for Linux
  • Plesk 11.5 for Linux


Qmail doe snot work. Service is unable to start:

    # service qmail start
    $Starting qmail: failed

In the mail log can be found the following error:

cannot start: unable to open mutex


Necessary file /var/qmail/queue/lock/sendmutex is absent.


  1. Create this file manually:

    touch /var/qmail/queue/lock/sendmutex
  2. Assign them the proper ownership:

    chown qmails:qmail /var/qmail/queue/lock/sendmutex
  3. Restart qmail service:

    service qmail start

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