As another anecdotal data point, I really have noticed a huge drop in spam beginning some time last year. My spam folder (filtered into by my ISPs Spamassassin installation) that used to be bulging ever day, now receives only a small trickle, and is even totally empty on some days, which used to be unheard of. I have long wondered what has caused the drop, which was quite sudden. A bust of major spam-sending botnets?
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