You could also create a custom field in the user table, user_signup_email_address. Then, when the user validates, you could copy (by means of a plugin), the email address to this new field. Like this, the user can later change his/her email address and you still have the address they signed up with.
Ivan
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Iyengar Yoga Resources / GT Plugins
Ivan
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Iyengar Yoga Resources / GT Plugins