> /me is going to go with Envelope-To, as it's going to be the easiest to
> explain to users "this is from the envelope at SMTP delivery time, not the To:
> or Cc: or anywhere else".

FWIW, we chose the closely related X-Envelope-To: for this function many years
ago. (At the time best practice was to use X- prefixes on nonstandard headers.)

If we were doing it today we'd use Envelope-To:.

                                Ned

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