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I've installed the webform module in my drupal site and want to configure it so that the submission limitation is by email instead of cookies. I dont want users who have already submitted to submit twice if their email is in the system. Is there a way to do that? Would I Have to create a new module for this? If so, how do I communicate my new module with the webform module? Or would editing this webform module be the solution (which I dont think is a good idea in case I have to upgrade it and lose the changes I've done). Please help. Thanks.

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You can use the webform validation to create a rule that compares the e-mailaddress with all e-mailaddresses in the table where the webform data is stored (you will have to look it up but I believe it is the email field in the webform_emails table).
Or you can create a custom module depending on webform_validation to compare data, there is a similar issue in the issues..

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    How would I create a rule that checks the values in the email field when the validation rules are very limited? The ones provided are
    – gerl
    Commented Aug 7, 2011 at 16:17

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