Email spam can be more than just annoying; it can be potentially dangerous to your computer. It can be a source of various malicious viruses and spyware. Therefore it is very necessary to guard your computer against any unwanted email spam. These days it has become much easier with the help of many free email spam filter options. There are various free email spam mail blockers or filter options that you can choose from. Here is a rundown of some of the most popular free spam blockers for emails