I get this in imunify360 under incidents:
Feb 23 22:31:14 domainnamescrubbed postfix/master[8348]: terminating on signal 15
Sensor: ossec Rule: 3333
I have this in my logs:
Feb 23 19:31:42 domainnamescrubbed postfix/postfix-script[42719]: stopping the Postfix mail system
Feb 23 19:31:42...