Most of the emails sent on the internet are SPAM. More businesses think they can attract customers by sending spam to many thousands of people all over the world. As a result that has become a big business and people get tired wasting time to clean their mail boxes from the spam messages sent to them on daily basis. There are multiple ways to avoid getting spam e-mails or at least decrease the number of such mails delivered to your inbox to a minimum. There are some very important rules to follow.