Qmail does not start: cannot start: unable to open mutex

Created:

2016-11-16 12:42:21 UTC

Modified:

2017-08-16 18:25:08 UTC

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Qmail does not start: cannot start: unable to open mutex

Applicable to:

  • Plesk 11.x for Linux
  • Plesk 12.0 for Linux

Symptoms

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

Cause

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

Resolution

  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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