But for me, it's not so much the amount of spam as it is its effect on bandwidth I pay for. And since I run several mail servers, this is a significant issue to me. But I take a slightly different view of what should be done.
The large majority of the spam I have seen (and still see because spamassassin isn't 100%) comes from a spammer, but a spammer who's been paid by someone else to get their message out. The message isn't from the spammer himself, it's from someone wanting to sell me something. So while I feel spammers deserve to spend the rest of their miserable lives rotting in jail, I don't think they should be the primary target (except in the cases of fraud).
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