To make sure the email adress entered in a form is valid, the notification system should be expanded to allow for a "opt-in"email - so the user gets a mail with a link, and when the link is used, the email adress is verified in the gravityforms entries.
very useful for a in newsletter system or, as I have in mind for a "voting" system ?.
(only one email pr. vote - no duplicates allowed, and opt-in email to assure, that the email exists).
thanks.