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[Brian Koontz <brian AT pongonova.net>]

On Sun, Feb 05, 2012 at 08:30:35PM -0600, Futuro wrote:
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> Are you speaking about RFC 5321[1]?

Actually (and your suggestion pointed me in the right direction),
RFC822, "Source Routing".  There's an example here:

http://www.remote.org/jochen/mail/info/address.html

(grep for "Source Routes")

So I know it's possible, but whether any MTAs are actually able to
parse it is another story.

  --Brian