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Spammers send spam as a form of
free advertising, which is illegal in most cases. It is similar to a
telemarketer calling you collect. No other kind of advertising costs the
advertiser so little and the recipient so much. It can cost the
recipient additional time and money spent on the Internet to view and/or
delete spam. The recipients are not the only victims—ISPs are also taken
advantage of. Many ISPs promote their free trial offers to the public,
which prompts spammers to 'sign-up' and give the free service a try. The
spammer then uses this opportunity to send spam to numerous email
addresses, both valid and invalid ones. Then they abandon the trial
account, forcing the provider to rectify spam complaints and monitor
spam/abuse issues.

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