Hello,
Sometimes it happens that wrong e-mail addresses are entered in forms by mistake or on purpose. It would be nice if it would be possible to send a confirmation link before submitting the form so that the person must first confirm that the email address exists. After that the person could click a link to continue processing the form. If the confirmation link is not clicked (do to a non existing email) the started form can be deleted after a specified time frame.
It would also be nice to be able to check emails for disposable addresses.