We should require that DKIM signers only sign messages that are
RFC 2822 conformant. (We will need a small amount of text that
explains why.)
I'd be inclined to say that messages to be signed SHOULD conform to
2822. There are some 822 MTAs that produce nice clean messages that
pass through relays with little trouble, such as the one I'm using.
The explanatory text is indeed important to make it clear we're not just
being religious purists.
R's,
John
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