bug#51733: 27.1; Detect impossible email addresses better

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> There's no scanning -- rmail displays the From header, right?  So it
>> does decoding before displaying the header.  It has to do the textsec
>> stuff first, too.
>
> Not if textsec is optional, it doesn't.

I don't understand what you mean here.  rmail will call
(decorate-suspicious-email from) and then insert the result into the
buffer.  If textsec is switched off, it'll just return `from' as is.

> And I think your mental model of how Rmail presents the email in the
> reading buffer is not accurate.

Here's what it does today:

          ;; Decode any RFC2047 encoded message headers.
          (if rmail-enable-mime
              (with-current-buffer rmail-view-buffer
                (rfc2047-decode-region
                 (point-min)
                 (progn
                   (search-forward "\n\n" nil 'move)
                   (point))))))

It'll just have to call

(insert (rfc2047-decode-string (decorate-suspicious-email (substring ...))))

instead.

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