for a sufficiently large ISP (think AOL, or a cable modem business),
keeping track of the tuples of <sender, recipient> for any length of time
will require a _substantial_ database infrastructure.
i was going to do some back-of-envelope computations on sizing, but
this is your proposal, mitch, so why don't you do them and share the
results with us.
Under 1K of data. Remembering stuff is doing it the hard way. Create
the lhs of the Message-ID signed with a private key that changes
daily. If the "response" doesn't have one you could have generated
recently, it's bogus.
Seth
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