Run mail on port 2525

[kilburn]

Setup a new smtpd service in /etc/postfix/master.cf (copy the current line for smtpd and change the port (service type column) to 2525). At the end you should have something like (2nd line is what is added, you can remove the first or leave it there as you wish)

Code:

...
smtp      inet  n       -       -       -       -       smtpd
2525      inet  n       -       -       -       -       smtpd
...