Nolisting – Poor Man’s Greylisting
I thought this was an interesting option to try to weed out some spam on servers inundated by spam. It wouldn’t be a permanent fix as it would only require a trivial workaround. But in my experience, these types are lazy and will go off to easier pickens if they run into too many problems.
Update
I bookmarked this site late last week, but wasn’t able to connect just now. If the site doesn’t come back shortly I’ll post a link or two to other sites discussing. Or if I can find the time, post my own implementation.
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