On Fri March 11 2005 18:10, John C Klensin wrote:
If the rules of 2821 are followed, then there is no
mechanism by which headers can be injected into a message other
than at the beginning, making a message with fields ordered as
Return-path
Received
Received
To:
From:
Date:
Received
Received
MIME-version
a little dubious.
However,
Return-path
Received
Received
Resent-To:
Resent-From:
Resent-Date:
Received
Received
To:
From:
Date:
MIME-version
is not at all dubious (ignoring the missing colons and empty field
bodies, of course). I believe that's what's behind the 2822 ABNF
field grouping.
I believe, however, that 2821 section 3.8 and its subsections
provides a mechanism whereby all sorts of things, including
reordering of fields within the message header, can happen.