Cannot start Postfix – Postfix integrity check failed Error

Postfix was not running and an attempt to restart Postfix was failing with the following error in maillog.

mail postfix/postfix-script: fatal: Postfix integrity check failed!
mail postfix/postfix-script: fatal: the Postfix mail system is not running

We have tried a number of solutions and after a bit googling, we found the following command and running that resolved the issue.

postfix set-permissions

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