How to change default port 25 to 995 or any other on Postfix mail server

If you need to change default mail delivery port of Postfix mail server from 25 to any other port lets say to 995. Here is how:

Edit /etc/postfix/master.cf  – a small note to make here is master.cf is located on same location on mostly all Linux distributions as well as FreeBSD.

Find line with:

smtp      inet  n       –       n       –       –       smtpd

Change smtp – which is actually a reference for port 25 to whatever port you need – i.e. 995 After change line should look like:

995      inet  n       –       n       –       –       smtpd

Save config file and restart postfix to load new settings:

# /etc/rc.d/postfix restart
postfix/postfix-script: stopping the Postfix mail system
postfix/postfix-script: starting the Postfix mail system

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