I told you, in the prerequisites, that you need an ISP that doesn’t block port 25 to be able to run your own mailserver. All mail connectivity uses port 25 for all it’s SMTP traffic. There are workarounds to solve this problem but they usually needed a friend or relative that has a running mail server who would receive your mail and forward it to you on a different port-number. Problem is that there aren’t many people running a mail server and are technical enough to help you out with this. But there is help….

I knew that there are service providers that will provide you this service but at a cost. But today I got pointed to a service provider that will provide you this basic for free. You can find them at http://www.rollernet.us. Just register at their site for a free account to be able to setup your service. You can look at this page to tell you how it works.

All you need to do is change one line in the /etc/postfix/master.cf file, change the line:

smtp inet n - n - - smtpd

into

2525 inet n - n - - smtpd

and restart your mailserver to start receiving your email on port 2525.

I wanted to let you know that I have no connection to the Roller Network LLC. Just wanted give you some info to let you run your own mail server when your ISP is blocking port 25. If you know of other service providers providing this service for free let me know and I’ll list them here as well.