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You need to know the email address to know the email address - as logic implies.
When a user registers, if they supply an email address, you can just keep it in some kind of database, and then fetch it. Have the database accessible by username, and then you can simply match when needed.

-nuffin
zz zZ Z Z #!perl

In reply to Re: Detecting an email address by nothingmuch
in thread Detecting an email address by Anonymous Monk

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