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Re:JMAP – a much needed modern email open standard by __MatrixMan__ on Tuesday May 30, 2023 @06:10PM (#36131658)
I have fastmail configured to accept *@{my name}.{my domain} and then I have a rule for each blocked sender. So it's it opposite of the logic that you want: I'll receive they mail until I explicitly block you.

This is still not implicit block like you're after, but when I looked through the settings to see how I had it configured I discovered this integration with 1password: https://1password.com/fastmail/

which, now that I know about, I may start using.

Re:JMAP – a much needed modern email open standard by gcanyon on Tuesday May 30, 2023 @07:01PM (#36132310)
At least from the promo video that seems very much like Apple's "supply a unique email" feature. Which is better than nothing, but waaaaay less feature-ful and much more manual than my ideal setup.