Peter J. Holzer wrote:
[3.9]
Note "the message header section [...] MUST be left unchanged".
We're in Last Call about this, this will be the "law", if you
think it is flawed please say so - but better not only on the
DKIM list.
Thanks for pointing this out. I do think this is flawed. Not
only prevents this inserting or altering a "Sender" field,
I'd be tempted to accept this as collateral damage, but this...
it also contradicts RFC 2369 (a proposed standard), which
recommends inserting various "List-*" fields into the header.
...is of course serious. The Last Call was premature, we need
to go through the complete draft, one section per week, or a
similar approach. Now I'm very curious what John thinks of
touching MUSTard in 2821bis, I recall his comment about a MUST
in my "4409 to STD" proposal (also related to 4406 oddities).
Frank