How do I fix "qmail: alert: cannot start: unable to open mutex"?


well, this shouldn´t happen at all, but it happens if you empty the queue by just deleting the files in the /var/qmail/queue directory, anyhow, just recreate the file and you will be fine:

  • /etc/init.d/qmail stop (or qmailctl stop)
  • touch /var/qmail/queue/lock/sendmutex
  • chown qmails:qmail /var/qmail/queue/lock/sendmutex
  • /etc/init.d/qmail start (or qmailctl start)

that should do the trick!

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