The IANA Considerations section is missing. I suggest registering
the header as specified in RFC 3864.
We purposely did not make this extensible in this document.
I think you're talking past each other here. I read SM's message
as adding VBR-Info: to the list of known mail header lines here:
http://www.iana.org/assignments/message-headers/perm-headers.html
That seems reasonable. I agree (having talked to the same companies)
that there is no point in making the header itself extensible at this
point.
R's,
John
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