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....
-- we can't easily stop rubbish from those servers without
blocking good users whom use those services. It would be so much
better if the big guys would shut up shop or otherwise crack down on
bad users and stop the problems that require SPF, DMARC and the like.
My fearful expectation is that "the big guys" will soon be a very short list, headed
up by AWS and Google Cloud. I haven't done AWS work in a couple of years now
but memory says that proper SPF was required to transit their infrastructure.
Kind Regards
AndrewM
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