This is exactly the problem with SES and why I told them its not workable
large-scale, although otherwise its good idea.
BTW - the same is also true for BATV (in fact the technologies are really
identical except SES allows for public dns verification server and BATV
its all private).
BATV doesn't require the sending host to remember anything about
messages it's sent. It uses signatures.
R's,
John
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