The field name in the form is field_N. The N starts from 0. For example, you have 3 fields in the form, the field names in the form will be field_0, field_1, field_2. If you want to control every field value in the email message, you can use %field_N% format.
please click the “Customize email & auto-response message” link, then put your customized message to the text box. Here is an example:
Customizing email message for EVERY field: Sender's Email : %field_0% Full Name: %field_1% Comments: %field_2% Cheers, Web Administrator IP: %IP% Date: %Date% Time: %Time%
As you can see, you can also use %IP% for sender’s IP, %Date% for date of server , and %Time% for time of server.
See below screen shot for details: