SPF

http://spf.pobox.com/ is the home page of "sender policy framework"

SPF-aware MTAs, according to the article in the current Linux Journal,
add a "Received-Spf:" header.

Maybe our header could follow this lead and be "Received-Status:"
-- 
david nicol
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Until I add you to my friends list, to get by Big Emet
the cowboy doorman your reply must include a listed
"magic phrase" such as "cat and buttered toast"