fatal: open lock file /var/lib/postfix/master.lock: unable to set exclusive lock: Resource tempor...

fuser /var/lib/postfix/master.lock

7881

kill 7881

postfix status

postfix/postfix-script: the Postfix mail system is not running

postfix start

postfix/postfix-script: starting the Postfix mail system

Postfix is running again!

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