A spammer can be in the world.Logical formLearned from3 sentences. Spammers may run a system.Logical formLearned from3 sentences. Spammers may change techniques.Logical formLearned from3 sentences. Persons may fight spammers.Logical formLearned from3 sentences. (Spammer urls) can be known.Logical formLearned from3 sentences. (Mail servers) may be used by spammers.Logical formLearned from3 sentences. A spammer can be illegal.Logical formLearned from3 sentences. Spammers may change tactics.Logical formLearned from3 sentences. (E-mail spammers) may pertain-to the world.Logical formLearned from3 sentences. Spammers may take advantage of a curiosity.Logical formLearned from3 sentences. Spammers may violate rules.Logical formLearned from3 sentences. Spammers may beware.Logical formLearned from3 sentences. (Internet service providers) may sue spammers.Logical formLearned from3 sentences. Spammers may buy shares.Logical formLearned from3 sentences. An (initial focus) can be on spammers.Logical formLearned from3 sentences.