On Thu, Mar 25, 2021 at 2:39 PM Charles Gregory <char...@possumdelight.com> wrote:
> I DO think this is an unnecessary problem that CAN be fixed/improved in > one of two fairly straightforward manners through DNS (behavior switch or > list authorized alternate domains). And I can't see anything but upside in > doing so; nobody has demonstrated a downside anyways. Yet I have no idea > how such decisions are made or the part that anyone plays here. I will > review RFC 4407. Thanks. > Even if ATPS had taken off, there's a matter of scale: Very large mailbox providers like Gmail, Yahoo, etc., would need to find some way to populate such a list. They could let their users do it (though getting users to do more work to manage their accounts is certain to be an uphill battle with a lot of configuration detritus as collateral), or they could try to automate it (a non-trivial and probably open-ended engineering investment). Neither path is appealing. -MSK
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