In the 15 May 2003 Crypto-Gram Newsletter, Bruce Schneier provides a
short discussion of some of the benefits and pitfalls of the "unique
email addresses" used by some to detect leakage of email addresses from
one site to another.
See: http://www.counterpane.com/crypto-gram-0305.html#6
In summary: The technique is very useful as long as you manage to ensure
that you don't reveal one your addresses by accidently giving it to the
wrong person.
bob wyman
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