Hello,
We can submit the form in body of the email using below code,
//Here is the email body node
IXMLDOMNode EmailBodyNode = "Prepare the body node to what values we need to show in body";
//Email adapter connection
EmailAdapter email = (EmailAdapter)thisXDocument.DataAdapters[emailAdapterName];
email.To = "<ToAddress>";
email.CC = "<CCAddress>";
email.Subject = "<EmailSubject>";
email.Intro = "<Introduction>";
email.AttachmentFileName = "Data.htm";
email.SubmitData(EmailBodyNode);
Note: Above code in C#.