On 24/May/11 16:14, John R. Levine wrote:
Although it is a minor number of messages, I don't think that
ignore-by-design could play a winning role here, because --unlike
mailing lists-- there is no way to eventually fix this at the
forwarding MTA.
If the EAI work is any guide, in the long run everything will be 8 bit,
and downgrades will eventually go away.
Well, this consideration suggests it would be smoother to remove the
recommendation to use transfer encoding now, rather than suddenly turn
it into the opposite recommendation in a post-EAI DKIM spec.
Anyway, if that is going to take decades, a more robust
canonicalization could be worth its while.
In the shorter term, if the forwarding MTA is inclined to be helpful, it
can re-sign on the way out.
SPF experience says MTAs often don't help. Even if they did, the
resulting SDID would be neither the author's domain nor the MLM.
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