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Postfix Failed to start : unable to set exclusive lock: Resource temporarily unavailable

If you’re getting the following error starting Postfix on a Virtualmin system:

Postfix Failed to start : unable to set exclusive lock: Resource temporarily unavailable

You need to kill the process and start Postfix using the proper command.

To find the process:

#fuser /var/lib/postfix/master.lock
7881

Then kill it:

#kill 7881

Note:
If your system cannot find fuser following this article.

Reference:
https://serverfault.com/questions/804993/postfix-failed-to-start-unable-to-set-exclusive-lock-resource-temporarily-una

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