Make the email field a mandatory field. That way they cannot send the form unless they input an email address.

Do do this, simply click on the email filed and then click on the Validate tab. Click on the box that has "No constraints" and choose Email Address.
Then put a check in the Csutom Error Message box. In the box below that- write your message like: Please put a valid Email address in the Email field. Thank you.

Then below that, put a check in the data required and set your minimum and max character limites (5 and 45 should do).

Click ok. Save and Publish.

Andy

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