Junk mail, or also known as spam, is basically the receiving of unsolicited emails in a bulk form from a source you do not know of and do not trust. Junk mail is one of the most common incarnations of spam, joining spam in instant messengers, Usenet groups, search engines, blogs, classified ads and even digital faxes. Junk email represents the largest and biggest source of spam on the internet and is a problem that is literally world wide.

Continued here:
Getting Rid of Junk Mail Was Never This Easy

Share/Save/Bookmark