How to check Postfix queue size or find the count of messages in queue
mailq | grep -c "^[A-Z0-9]"
You can also grep the last line :
mailq | tail -1
How to change Postfix default smtp port to 2525
article1 By default Postfix listens on Port 25. You can change it to any port. In our case, we would want to change it to 2525. vi /etc/postfix/master.cf Replace smtp inet n - n - - smtpd with 2525 inet n - n - - smtpd Restart Postfix service. systemctl restart postfix.service
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