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A comment on Ask HN: Why isn't whitelist only email used more often or even the standard?. Parent comment

Re:Ask HN: Why isn't whitelist only email used more often or... by _Schizotypy on Thursday October 18, 2018 @01:59PM (#18250531)
The solution seems pretty simple to me. First sent email is automatically preceded by a request which the receiver can accept or deny. If deny, all incoming communication is blocked, if accepted sender is added to whitelist. No website or separate approval process needed.
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Re:Ask HN: Why isn't whitelist only email used more often or... by stephenr on Thursday October 18, 2018 @07:32PM (#18253232)
Why have the initial pre-message then? Why not just have a client that prompts on unknown senders?

Edit: or maybe that’s what you meant?

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Re:Ask HN: Why isn't whitelist only email used more often or... by _Schizotypy on Monday October 22, 2018 @12:54PM (#18276249)
Request was just a generic term for asking permission in some way, a client prompt would work. Preferably logged in some fashion.
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Re:Ask HN: Why isn't whitelist only email used more often or... by stephenr on Monday October 22, 2018 @01:45PM (#18276675)
I think you could probably do this now with a good enough client and mail processing rules.
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