This idea isn't so new or unique. It's been discussed a fair bit on the
ASRG [ietf.org] mailing
list under the name "tempfailing".
First I heard of it was from Landon Noll and Mel Pleasant. It is
noted in brief as one of the techniques in
this plan to
end spam [templetons.com] (though their plan, which did include the triplets, is
not laid out in full there.)
It is a worthwhile technique for a little while, and if spammers
were rational, would be worthwhile for some time to come. But
spammers are not rational, and already this technique is not as
useful as would be hoped.
Tempfailing is not new and unique (Score:5, Informative)
First I heard of it was from Landon Noll and Mel Pleasant. It is noted in brief as one of the techniques in this plan to end spam [templetons.com] (though their plan, which did include the triplets, is not laid out in full there.)
It is a worthwhile technique for a little while, and if spammers were rational, would be worthwhile for some time to come. But spammers are not rational, and already this technique is not as useful as would be hoped.
Do a Google Search for Tempfailing [google.com] especially in ASRG to see statistics etc.