Hi Winan,

You might take a look at the following line:

http://www.palomine.net/qmail/relaying.html

The gentleman that wrote the article about FAQ 5.4 seem to know alot about qamil. He includes his email in this article and invites questions. Based on what I read, he discourages SMTP security by obscurity by changing the defualt SMTP port 25. There seem to be better solutions.