JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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To help you better, please give us more detail about the error you are encountering.
If you want to reply incoming submission email from your email box, you need to set your "Reply-to Email" setting as a email field's name which is in your form. With that, Upcoming email submissions come with the users' email. So, you can reply those emails directly in your inbox.
To do that,
1) Open the current "Notification".
2) On the appeared window, click to "Reply-To and Recipient Settings".
3) On that screen, change the "Reply-to Email" as a email field's name which is in your form
If it doesn't match with your request, please give us more detail about the problem.
Have a great day.
Also, if you refer for using the email submission content on reply. After applying the steps from the thread above, you can send an email to the user with the data of the submissions by using the "Forward" option from your inbox.