>> RFC 4871 is of 2007 and reports an issue with it. Section 5.3
>> practically says that 8bit SHOULD NOT be used.
>
> It's hardly the 8bitMIME extension's fault that DKIM is misdesigned - It
> isn't at all difficult to define a signature mechanism capable of surviving
> encoding changes. The DKIM group simply chose not to do it, making a
> design tradeoff that severely limits DKIM's applicability.

Don't confuse what's sent on the wire with what's done in the
canonicalization.  DKIM doesn't prevent sending 8bitMIME... it just
says that it had better be canonicalized with RFC 2047 encoding when
you make (and verify) the signature.

Barry
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