Computer Tips - Postfix: not listening to port 25

Date: 2019sep20 Product: Postfix Q. Postfix: not listening to port 25 A. Ensure your firewall is open and check... In /etc/postfix/main.cnf Change from
inet_interfaces = localhost (This is the default)
to
inet_interfaces = all
On Azure you need to ask special permission for this port to be opened.