[ietf-dkim] RFC4871 5322.From Binding - Proposal to relax it.

[Scott Kitterman]

On Thursday, September 16, 2010 03:23:15 am Hector Santos wrote:
> Scott Kitterman wrote:
> >> My Technical recommendation.
> >> 
> >> 1) For 4871bis, we should consider relaxing the 5322.From
> >> 
> >>    binding requirement from a MUST to a SHOULD.  This will help
> >>    justify its new words of "separating the signer domain from
> >>    the author domain."  There is no separation until the 5322.From
> >>    binding requirement is relaxed.
> > 
> > As discussed during the original DKIM development effort, this
> > is about protecting content from modification. The base DKIM spec
> > already doesn't treat 5322.from specially, so such a change in not
> > needed to meet your specified goal.
> 
> Excuse me if I don't understand your reading.  5322.From is the only
> header that is required hashing. Is that not a special consideration?
> 
> I think it will serve the community interest to find out why this
> large MTA vendor revised there open source software three years later
> presumably after extensive field operations to include a new option to
> relaxed the 5322.From binding.

Finding out why sounds reasonable.  What you propose isn't finding out why, but 
assuming it's valuable without bothering to find out.

Scott K