>I think you shouldn't worry about the similar-but-not-exact names case, only
>the exact names case. If all the addresses are the same name (and there is 3
>or more) then I think it would have to be a spam message (unless someone can
>think of a case where that wouldn't be true).
In a manual review of 20 E-mails from our spamtrap, only 1 had multiple
instances of the same or similar E-mail accounts. It looks like about 1/3
of the spams with multiple same-or-similar addresses are ones where there
are multiple copies of the same account name; the other 2/3rds are
similar. So we're talking about maybe 1-2% of spam that could get
caught. Still, aside from the abuse@/postmaster@ issue (which could easily
be dealt with), it would likely have an extremely low false positive rate.
-Scott
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