Qualcuno usa il mio indirizzo di posta,che fare?

E un po' di tempo che mi arrivano mail del genere:
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From: System Administrator
To: cajenna1@tin.it
Subject: Undeliverable: gT7orLpcgDU Hey Cdfe, We can *0ffer* u *BEST* *G*A
*Y* T33NAG3RZ *p0*Rn* c0llecti0n in internet!!! HURRY!! h5E8L5cuKm8gZ2kz
Vw4JL XRbpECDVfxd
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Your message

To: Cdfe
Subject: gT7orLpcgDU Hey Cdfe, We can *0ffer* u *BEST* *G*A*Y* T33NAG3RZ
*p0*Rn* c0llecti0n in internet!!! HURRY!! h5E8L5cuKm8gZ2kzVw4JL
XRbpECDVfxd
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Message-ID:
From: Cajenna1
Reply-To: Bostjan2675
To: Cdfe
Subject: gT7orLpcgDU Hey Cdfe, We can *0ffer* u *BEST* *G*A*Y* T33NAG3RZ *
p0*Rn* c0llecti0n in internet!!! HURRY!! h5E8L5cuKm8gZ2kzVw4JL XRbpECDV
fxd
Date: Wed, 26 Nov 2003 09:32:12 -0500
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HIGH QUALITY


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Mdf/2Q==

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Oppure tipo questa:
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Date: Wed, 26 Nov 2003 14:59:31 +0000
From: Cajenna1
Subject: eCuCkf2uq3J Hey Edchiu, We can *0ffer* u *BEST* *G*A*Y* T33NAG3RZ *p0*Rn* c0llecti0n in internet!!! HURRY!! xWRFfZvtyfjo5i8Ou7NKl pgYKv1gX40u
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Ho già provato con mail washer ma continuano ad arrivarmi ugualmente,siccome il contenuto sono indirizzi di siti porno,non vorrei trovarmi nei guai!!
Che posso fare?

non ci puoi fare niente, sono dei virus che inviano delle email con degli indirizzi presi dalla rubrica di outlook oppure presi dalle pagine internet presenti nella cache di IE.