Hi Hilary,
Thank you so much for your help as always. Much appreciated. I meant my sentence italicized as "Is it possible to set the data connection that allows the submitter to receive an InfoPath form via email once the form (InfoPath Form Library) is submitted?" :-)
Sorry, I am using a SharePoint Premise. I have tried to insert a filed (DisplayName or UserID) or insert function (UserName) for the 'To" field, but it does not work at all. See the screenshot below of the data connection being set.
I don't think I am able to leverage the user profile service to get the email that I already tried before. So, I wonder is there any solution for this? It's greatly appreciated. :)