The e-mail will be generated with this name in the headers. If this is not specified, a default response will be generated by the script. If any of the specified fields are empty, the user will receive a warning, and the form will not be submitted. This field specifies a list of environment variables that should be submitted along with the form contents. This is useful for recording, for example, the IP address of the user submitting the form.
Case is important for environment variables.
You can see the typical environment variables using the test.cgi script. This URL can be used to allow users to return to, for example, your home page.