Monitor Postfix mail Queue
watch -n1 mailq Credits: https://www.techbrown.com/monitor-postfix-mail-server-ubuntu-16-04/
List process run by user
Replace the [username] with the required username If you want to use ps then ps -u [username] OR ps […]
Monitoring CPU , Memory and Resource Usage Linux
sudo apt-get install htop htop http://www.upubuntu.com/2012/06/list-of-best-system-monitoring.html
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