The Economist has a chart from Kaspersky Lab, a security firm, that shows that spam mail is on a decline. Supposedly, it's a combination of spam filters actually working, the authentication of senders and more police crackdowns on Nigerian princes.
In fact, in the past year, junk mail has declined from around 80% to 67%. Do you guys agree with this study? Are you noticing less spam in your inboxes? [The Economist