Re: [ietf-dkim] (registered) domain name (Re: errata revision: opaque)

[Murray S. Kucherawy]

I understand the desire to constrain the SDID to be a registered name or 
under one, but is there a need to make this normative?  DKIM verification 
simply won't work if the SDID doesn't meet that criterion, and perhaps 
that's good enough.
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