On Wed, Mar 25, 2020 at 01:43:07PM +1100, Richard Salts wrote:
> On 23/03/2020 8:55 am, Viktor Dukhovni wrote:
> > It is best to not modify the message headers at all, which iseffectively
> > what the Postfix list does (it adds a Sender: header which should not be
> > covered by the upstream DKIM signature).
>
> I know the Sender header has traditionally been used by mailing lists,
> but would the Resent-Sender from rfc5322 be better in case people send
> to the postfix mailing list with a DKIM signature for an existing Sender
> header
No. The correct header for mailing lists is Sender. DKIM signatures
should not cover the Sender header (unless the intention is specifically
to preclude mailing-list distribution).
--
Viktor.
