Re: Last Call: draft-resnick-2822upd (Internet Message Format) to Draft Standard

[Brian E Carpenter <brian.e.carpenter at gmail.com>]

I am disturbed that the messy situation of X- headers,
created by RFC 2822's silence on the subject, has
not been fixed.

See http://www.ietf.org/IESG/APPEALS/klensin-response.txt
for an example of the issues that this silence can
create.

I believe it would be appropriate to document that although
X- headers are widely used, they are not part of the standard
format and their treatment by Internet MTAs MUST NOT be relied on,
unless registered under RFC 3864.

   Brian
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