I am thinking of building a email server instead of hiring an email service provider. Can anyone tell me if it is very complicated to build such system with no technical background?
It can take a while, if you have no idea what you are doing, but there are many tutorials around the web that should help you. Here is one http://flurdy.com/docs/postfix/ Code (markup): Be advised: If you use your server to spam, you'll get blacklisted in no-time.