Richi posted a nice introduction on how spammers actually send the millions of spam mails every day. He begins by describing two ways of sending spam mails: traditional and viral.
The traditional sending occurs either from local broadband connections or even from own server farms. Sending out 10 million spam mails who take up about 100 Gb of Data takes up to five hours on a T3 connection.
The viral spammers use trojans and virii to infect other peoples computers and then send the mail from these instead of from their own connection. You might have heard that the dutch police recently captures three spammers who infected up to 1,5 million computers.
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You may want to add a way for people to get in touch with you to contribute tips.
http://blog.kevingunn.org/archives/2005/12/sorting_your_em.html
You may want to check that. sorry if it’s already on the site somewhere.