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2 options.
Someone you guys know is infected and the mail simply sends itself to the people in his address book, grabbing a random file from the harddrive and infects that file
Other option. Surfer visits your site and another site. Surfer is infected and he doesnt know it. The virus checks the internet cache and finds the email from site a and spoofs it to send an email to site b also found in the cache.
Im always amazed how people dont understand this or dont know where these emails come from. Its really webmaster lesson 3 in the newbie guide.
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