Add a "REPLY ALL" button/option on the submission page to send a group email to all emails entered in the form.

Is there a way to send one email (group email) to all submissions with a reply message? 

If this is an email group then it will automatically forward the email to the email address listed to the group, right? Could you further explain or show us a screenshot of what you are referring to so we can check it?

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I have a summer camp registration form. On the form each parent enters an email address along with other information about the student. I would like to notify all the parents of their child's acceptance into the camp. However, I don't want to send individual emails times 63-100 vs method to send one message to each different email address. Currently, I can email only one parent at a time.
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I see. It is like "REPLY ALL" the email on your submissions page, right? Unfortunately, it is not yet possible. However, you can create/compose an email and then place all the parent's email address to the recipients using Gmail or Yahoo mail.

- How to Send Out Email Without Showing Addresses

Yes, this would be a nice feature to have if there are large numbers. Also, making the replay all secure so the message is sent with out sharing emails. Thank for helping
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I am sending the thread as a feature request to our backend team for evaluation. We cannot guarantee that the feature will be implemented or cannot provide any time frame for implementation at the moment. However, once we have any information in this regard, you'll be posted here.

Thank you!