Cannot start Postfix – Postfix integrity check failed Error

Here is what you can do when you are unable to start Postfix and you are getting Postfix integrity check failed Error. 
Here is the scenario:

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 several number of solutions and after a bit of research, we found the following command works and running that resolved the issue.

postfix set-permissions

Using the above command solves the issue.
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