>>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 _______________________________________________ Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf