On Thu, Jan 22, 2009 at 1:02 PM, Bill Moseley <moseley at hank.org> wrote: > I did a database conversion a year or so ago where the specification > called for unique email addresses. I quick database query showed that > there were a number of instances where the same email address belonged > to different people at different times. That's a good point. This happens all the time at universities. You generally get a 6 mo "grace period" after graduation, after which your email address goes back into the pool of email addresses available. Theoretically within only a couple of days the same address could belong to two different people (assuming the IT dept doesn't have a policy of waiting another x months after the email address has been shut off before it can be reassigned). -- Matt Warden Cincinnati, OH, USA http://mattwarden.com This email proudly and graciously contributes to entropy.