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Subject: Re: Pcitures in 'From' Header
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Wes Hardaker <wes@hardakers.net> writes:

> So, the X- was dropped which I meant to ask:  is that legal?  IE, is
> it an officially sanctioned header?  I though X- prefixes were
> required for non-standards headers?

No.  For email RFC 2822 doesn't require an X-prefix (cf. section
3.6.8).

For Netnews the Usefor draft actually discourages X- in headers that
are not intended to be human readable.