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Can you please return to your thread here and explain more to us about what you mean by "form completion email"?
This is a very broad topic so I am not entirely sure that I understand you yet.
Did you mean that you want to received the completed form via email? If so then see http://www.jotform.com/help/25-Setting-Up-Email-Notifications.
Or do you maybe mean you are not receiving the email notifications for your completed form? If so then please see http://www.jotform.com/help/293-How-to-view-all-your-form-Email-History, http://www.jotform.com/help/262-How-to-remove-your-email-address-from-bounce-list, and http://www.jotform.com/help/208-How-to-setup-email-alerts-to-prevent-email-bouncing-related-issues for additional information to help resolve this issue.