How can I turn off digest mode in the email messages that are generated

How can I turn off "Digest" mode in the email messages that are generated by user responses to a JotForm?

If I understand correctly, you wanted the submission email to appear separate or not grouped by the same Subject line the email have.

Example, Gmail by default group the emails by Subject and Sender. 

So to make them appear on separate subject always, the Subject line should be unique.

You can use the same resolution provided by our colleague on this discussion thread.

I hope this help. Let us know how we can be of further assistance.