On Thu, 15 Nov 2018, Bart Butler wrote:
The MUA could always have some kind of warning in this situation if the UserID match
isn't recognized ("recognized" matches could include subaddresses, etc. but
would be at the MUA's discretion). I'd leave this up to the MUA implementation.
Requiring the MUA to do this is wrong. It will break many potential use
cases. Take for example my phone mail client. It is hard to support PGP,
but it is easy to send it over TLS to my MTA. My MTA can then do all
the work to PGP encrypt it. But there are no humans in this process.
Please ensure this feature works without humans.
Paul
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