Keith Moore writes:
the fact that it works as a spam filter today seems like mere circumstance
or accident; I don't see any inherent reason that it will be a reliable spam
filter going into the future. Spammers do learn, if slowly, so if they
have to learn to make sure their EHLO arguments match their source IP
addresses, they'll do that. In the long term, I don't think this check
helps anything.
Yes, I agree. Domain validation is not mainstream, but it is being use in
practice, just enough to fall under the radar stream. If for any reason –
whether explicitly blessed in an RFC or for any other reason – it becomes
more prevalent then spam generators will certainly adopt.
But at least right now it is a very effective filter. Like I wrote, this is
really against my self-interest to bring more awareness to it.
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