This is really a policy issue.  If you get a message with 8bit
characters and a DKIM signature, and your outgoing channel is 7bit, do
you downcode it so you can deliver it, at the cost of breaking the
signature (which, according to DKIM rules, is not an error, but just
equivalent to no signature), or do you preserve the signature?  It
depends.

right, so an implementation would offer a knob.

It might, or depending on the nature of the implementation, it might be able to do something without a knob, e.g., if it adds its own signature, it could always downcode if needed, then sign.

So I'd prefer noting that if a message is signed, the MSA should
consider what effect downcoding will have on the validity of the
signature, but not offer any advice about when to do what.

I can live with this advice.

Oh, good.

Regards,
John Levine, [email protected], Taughannock Networks, Trumansburg NY
"I dropped the toothpaste", said Tom, crestfallenly.
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