Since that fateful day in late November or early December of 1971 when Ray Tomlinson sent the first email using a ARPANET (the predecessor of what we know as the Internet today), email has changed...a lot.

It became too popular for its own good. Everybody who had anything at all to sell or any message they wanted to promote discoved mass marketing email. Soon inboxes all over the world were overflowing with unsolicited marketing emails which came to be called SPAM.In 2003 the problem of SPAM had become so big and so intrusive that the Congress of the Untied States passed the CAN-SPAM Act.

It became the law of the land in January of 2004. CAN-SPAM is an acronym for Controling the Assult of Non-Solicited Pornography And Marketing. The opt-in list is the backbone of email marketing today and opt-in list building techniques are possibly the most discussed subject among affiliate marketers.