On 1 Sep 2009, at 15:22, Mr. Meitar Moscovitz wrote:

Do email messages contain some kind of "this was a forwarded message" header other than the conventional "Fwd: " prefix for a subject line?

I've not done an extensive analysis, but having spent a few minutes e- mail myself, it appears that at least Apple's Mail.app does have an out-of-band mechanism for indicating whether a message is a reply or a forward. Replies include both 'In-Reply-To' and 'References' headers; forwards include just a 'References' header.

That said, the Internet Message Format used in email is archaic by Internet standards - almost unchanged in over 27 years. (RFC2822 was a pretty minor update.) While it's been very successful, there are probably aspects of its data model that can be improved upon.

--
Toby A Inkster
<mailto:[email protected]>
<http://tobyinkster.co.uk>

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