Of the remainder, 20 percent are sexually explicit words, including “Orgasms” and “orgasm”, and around 30 percent are related to money ( “cheap”, “free” or “discount”).

Spammers, Sophos says in his study, are in the dilemma of having to include in their messages that they want the word “sell” and, moreover, have to flee from the filters “anti spam” that automatically deletes messages that contain them.

Therefore, 80 percent of the messages include “dissimulation techniques to evade anti-spam software at the gateway of the email. Tricks range from spell a word wrong on purpose, or using a zero instead of letter “o”, to more sophisticated techniques, according to Sophos, which has designed a program that is able, for example, to detect up to 5,600,000 ways in which the word “Viagra” can camouflage.

Sophos recommends that Internet users who “never” are not tempted to buy from a spam message, “because he says it is criminal.”

“If no one responds to messages from trash or buy products this way, spam would be as extinct as the dinosaurs,” he adds.

One of the largest companies in the computing world, IBM has launched a new tool to fight spam. The service, dubbed FairUCE, is structured around a large database that contains the identification numbers of computers spammers and are automatically returned to sender.

The Data Protection Agency (DPA), opened last February proceedings against 15 companies based in Spain for sending spam, but are 85 claims already received. In Spain, about 50 percent of all spam emails they receive are from Argentina and United States, according to the Association of Internet Users.