[ietf-dkim] THIS IS A MULTIPLE 5322.FROM MESSAGE
Murray S. Kucherawy
msk at cloudmark.com
Tue Oct 5 22:22:02 PDT 2010
> -----Original Message-----
> From: ietf-dkim-bounces at mipassoc.org [mailto:ietf-dkim-bounces at mipassoc.org] On Behalf Of Mark Delany
> Sent: Tuesday, October 05, 2010 8:06 PM
> To: ietf-dkim at mipassoc.org
> Subject: Re: [ietf-dkim] THIS IS A MULTIPLE 5322.FROM MESSAGE
> There was an assertion in RFC4780 about "conforming emails" that must
> only have a single 2822.From header. That got lost in the translation
> to 4781 I guess. Unfortunately, 4780 failed to specify what
> "conforming" means explicitly.
> I also know that this WG has repeatedly stated that messages that are
> not within standard MUST fail verification.
> That this is not in 4871 seems to be mostly a WG assumption that
> should be made explicit.
I think several of us thought it was in there, but on review it apparently was indeed lost somewhere along the way. We've certainly, as I understand it, been proceeding from that assumption for a very long time.
I like the idea of saying so explicitly in 4871bis, and applying it both to signers and to verifiers.
I don't like the idea of being any more specific than that. That is, I don't want to create specific text for specific cases we know about because that means anything we don't list could be perceived as less critical. A blanket admonishment to implementers is sufficient and appropriate.
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