Spam is junk e-mail, sent indiscriminately for the purpose of selling goods or services (often of a dubious nature) and can also include phishing attempts and virus infections.  I think the reason spam is unethical is that it disrupts your life.  Spam is unsolicited email, normally with an advertising content sent out as a mass mailing.  While the most widely recognized form of spam is email spam, the term is applied to similar abuses in other media: instant messaging spam, Usenet newsgroup spam, Web search engine spam, spam in blogs, mobile phone messaging spam, internet forum spam and junk fax transmissions.  Spam is filling up the Internet, and it's not going away anytime soon.  Spam is the same thing lots and lots of times.  Mobile phone spam is directed at the text messaging service of a mobile phone.

Mail

Email spam targets individual users with direct mail messages.  Email spamlists are often created by scanning Usenet postings, stealing Internetmailing lists, or searching the Web for addresses.  Email spams typically costusers money out-of-pocket to receive.  Some people define spam even more generally as any unsolicited e-mail.  Many spam emails try to look like an honest attempt to do somethingnice for you.  I've sometimes had a dozen or so identical emails arrivesimultaneously.  Don't publish your email address more widely than necessary.

Spammers

Spammers have abused resources set up for the purposes of anonymous speech online, such as anonymous remailers.  Spammers frequently use false names, addresses, phone numbers, and other contact information to set up "disposable" accounts at various Internet service providers.  Spammers send their spam largely indiscriminately, so pornographic ads may show up in a work place e-mail inbox—or a child's, the latter of which is illegal in many jurisdictions.  Spammers often use fake e-mail addresses, so those messages would fail authentication tests.  Spammers also guess at addresses using namegeneration programs, and even send thousands of messages thatbounce.  Spammers often hide their identities, and an investigation into a spammer can take months, Muris also wrote.  Spammers have effectively foiled the first strategy  analyzing the reputation of the sender by conscripting vast networks of computers belonging to users who unknowingly downloaded viruses and other rogue programs.  Spammers have used images in their messages for years, in most cases to offer a peek at a pornographic Web site, or to illustrate the effectiveness of their miracle drugs.  Spammers responded in turn by littering their images with speckles, polka dots and background bouquets of color, which mean nothing to human eyes but trip up the computer scanners.  Spammers have also figured out ways to elude another common antispam technique: identifying and blocking multiple copies of the same message.  Spammers have defied that technique by writing software that automatically changes a few pixels in each image.  Spammers won't have a problem complying with the law.  Spammers try to obtain as many valid email addresses as possible, i.  Spammers use numerous techniques to produce messages capable of by-passing all types of mail filters.  Spammers invent a tactic that gets around those products.  Spammers have made image spam really effective by using not just one but multiple filter-thwarting techniques.  Spammers make money from the small percentage of recipients that actually respond, so for spam to be cost-effective, the initial mails have to be high-volume.

Internet

Spam is flooding the Internet with many copies of the same message,in an attempt to force the message on people who would not otherwisechoose to receive it.  Help fight spam to keep the Internet useful foreveryone.  Take advantage of the information we've gathered to make your ownexperience on the Internet better.  But because the Internet is public, there is really little that can be done to prevent spam, just as it is impossible to prevent junk mail.  Some see spam-blocking tools as a threat to free expression—and laws against spamming as an untoward precedent for regulation or taxation of e-mail and the Internet at large.  Opening spam emails can also drop cookies into computers and disrupt Internet browsing.

Software

At that point, without some kind of filtering software, email becomes practically unusable.  Spam can be used to spread computer viruses, trojan horses or other malicious software.  This is simplest form of blocking, which yields very good results, because comment spam is targeted at bots, so it must be readable by simple software.  Today's bots are infected with modular, kit-based software that can easily be upgraded and reconfigured to take advantage of new vulnerabilities discovered in Windows; botnets are almost exclusively targeted at Windows PCs.  AOL and MSN both trumpet spam filtering systems like this in their latest software, and Yahoo.  Spammers use special software to "harvest" random e-mail addresses from the Internet.

Anti-Spam

Anti-spam laws are another attempt to raise the cost of spam to an intolerable level; no one wants to go to jail for spamming.  Anti-spam products block a certain type of spam.  Anti-spammers contend that spam is much more than just a nuisance or inconvenience to the message recipients in that it places physical as well as financial burdens on the Internet system and Internet service providers.  The antispam industry is struggling to keep up with the surge.

Spam is Born in the USA: First, 86% of all spam comes from the USA.  Spam is a phenomenon which is increasing daily, representing a high percentage of all email traffic.  Some spam is used as a method of spreading internet security threats such as viruses and other malware.  Image spam is a spam message that uses graphics to display the message to the recipient rather than plain text.  Comment spam is more costly than email spam because it either wastes the time of the website owner, who has to remove it, or it wastes the time of every reader of the website who has to separate the wheat from the chaff.  The vast majority of spam is commercial bulk email -- email that tries to sell a product or service.  From the sender's perspective, spam is an extremely efficient and cost-effective way to distribute a message, but to most recipients, spam is just junk email.  I feel spam is an enormous problem and a productivity drain.  The problem with spam is that you pay for it.