> The idea is so simple, that it is possible, that some others 
> have had it before. This does not matter - I have some less 
> to do (the DRAFT) - but it works great in ASSP.

Just to wipe some "fog" :)

When sending a message through an FBMTV enabled ASSP
the latter will retrieve the original message ID for the message
and prepend a unique signature to it; so, for example having
a message with a Message-ID header like

001501ca62d6$915c7740$213fd...@example.com

and sending it through ASSP, the message ID, after ASSP
FBMTV processing may become

sig.1566bcf893.001501ca62d6$915c7740$213fd...@example.com

notice the "sig.xxxxx.<original-message-id>" at this point,
since the Message-ID isn't "mangled" by other servers when
someone will reply to your message, ASSP will check the
incoming Message-ID for a valid (and own) FBMTV signature
and will strip it off, so the message ID will become (again)

001501ca62d6$915c7740$213fd...@example.com

by the way, in case of bounces, if the bounce is "valid" that is
generated by a message with a valid FBMTV tag, it will pass
otherwise, missing the tag in the signature the message will
be considered an "invalid bounce" and will be rejected

The beauty of this approach is that it doesn't mangle the sender
email address (as BATV does) so it eases dealing with email
addresses whitelists and so on while, at the same time, retaining
the same efficiency of BATV (ok, probably a better efficiency :D)


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