Project: LOOPBACK [1] doesn't seem to be doing all that much good actually. I have 24 hours of spam since I started (well, a few hours after I started, to make sure the DNS (Domain Name Service) records got propagated, and I have the same amount of spam now that I did prior to the start of this little experiement.
Sigh.
The results make me wonder if someone else tried this and the spammers have already taken this into account.
I could try changing the IP (Internet Protocol) address I use (say, to a private address, or one of the link testing addresses), but I'm not sure if it's actually worth the effort now.