When creating a form using the Submit by email button, and when testing the function, you get the below text as the default body of the email.

“The attached file contains data that was entered into a form. It is not the form itself.

The recipient of this data file should save it locally with a unique name. Adobe Acrobat Professional 7 or later can process this data by importing it back into the blank form or creating a spreadsheet from several data files. See Help in Adobe Acrobat Professional 7 for more details.”

It's crucial to be able to change the default text with our own custom text.