- Spam is most often considered to be electronic junk mail or junk newsgroup postings or even any unsolicited email that is usually advertising for some product and is sent to a mailing list or newsgroup.
- In addition to wasting people’s time with unwanted e-mail, spam also eats up a lot of network bandwidth. Consequently, there are many who have taken it upon themselves to fight spam with a variety of techniques. Some online services have instituted policies to prevent spammers from spamming their subscribers.
- It is usually sent with spoofed or harvested addresses to conceal the actual sender. It is sent in enormous quantities and are unsolicited.