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> Every time I give out my email address, behind the scenes a single-source permission/token is created.

How would this work exactly? You send the token to the recipient's email address? Doesn't that become a chicken/egg problem because the recipient could very well have the same requirement?

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Exactly what the other replier said -- with current protocols almost certainly not possible, and even with complete access to *@mydomain.com it would likely be a serious hack, brittle in many ways, and not robust in others. But with a new protocol underlying, I could see this all being handled automatically. (maybe -- I haven't walked through this with a technical person).

That's why he wrote it is probably not possible. Per-recipient email is probably best you can get

Under current email protocols, 100% agreed. If we get to define our own RFC from scratch then much more of this becomes possible under a single email.

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