Before you are able to block spam, of course, you have to know what spam is. Spam, actually, can be defined in various ways. But to avoid any complications, spam is any form of junk mail or email that just keeps on advertising. These are the kinds of mail, spam, that just give you headaches everytime you open your inbox.You did not ask for email about certain products that you do not even know of. You did not request for messages about your horoscope or other love advice….