Spamming

Salve,e da parecchio tempo che ricevo un' infinita' di spamm via email
da parte sopratutto di aziende farmaceutiche,lo spamm arriva con indirizzo
preso dal mio sito:



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Subject: February 75% OFF
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Date: Sun, 17 Feb 2008 07:47:31 +0100 (CET)
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non so come facciano, pero' ora stanno esagerando,se io bloccassi
questo indirizzo di ritorno sotto?
Return-Path: chatlinks@laughingdragonclan.com[/B]X-

hanno tutte lo stesso oggetto o stesso testo?
Se sì puoi bloccare anche quelli =)