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by fowl2 2881 days ago
What would be more/also interesting would be a way of expressing this intent by a sender.

Seems like (with absolutely no thought here) a new header could me minted for this - eg. "Transport-Security: Require". Tough part as usual would be getting MTA and client support, but switching to a per message approach would at least allow incremental rollout - and critically I think - allow introspection by following bounces.