bug#47616: 27.1; hardening mail-envelope-from

[Lars Ingebrigtsen]

Francesco Potortì <pot@gnu.org> writes:

> Hardening mail-envelope-from from sendmail.el by narrowing to the
> headers, as the doc says, corrects the problem that I observed.

Thanks -- I don't think we should change mail-envelope-from itself here,
because it may conceivably be called from other contexts.  Instead the
callers in sendmail/smtpmail should be altered to narrow to the headers
before calling it, and I've now done this in Emacs 28.  (This uncovered
a similar bug in smtpmail.el, too.)

-- 
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   bloggy blog: http://lars.ingebrigtsen.no