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Unsolicited messages are usually a kind of advertising, delivered in massive quantities. Although it can be done in various ways, the most widely used among the general public, is based on the email. Other Internet technologies that have been the subject of spam include Usenet newsgroups, search engines, wikis, forums and blogs. Spam can also be sent at mobile phones (via text messages) and instant messaging.

Spam by the email service was born on March 5, 1994. This day, a law firm Canter and Siegel posted on a Usenet message announcement of his law firm, which in the first days after publication, billed about $10,000 per case to friends and readers of the network. Since then, e-mail marketing has grown to levels unimagined since its inception.

Spam by fax (fax-spam), is another category of this technique of direct marketing, and by sending unwelcome faxes and mass through automated electronic systems.  This is sent to thousands of persons or companies at a time, whose information has been loaded into databases segmented according to different variables.

Spain spam is strictly prohibited by the Law of Services of the Information Society and Electronic Commerce (LSSICE), published in the Official Gazette of July 12, 2002. Besides, the owners of databases of emails might put into practice the Organic Law on Data Protection (LOPD) because of personal data. In fact, sentences in Spain relating to spam are related with this law.

 
In the United States enacted the CAN-SPAM Act, which was virtually ineffective.

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