You may include environment variables in the email message you receive after a user has filled out your form. This is useful if you wish to know what browser they were using, what domain they were coming from, or any other attributes associated with environment variables. The following is a short list of environment variables you may find useful:
To show remote host and browser sending the request:
<input type="hidden" name="env_report" value="REMOTE_HOST,HTTP_USER_AGENT" />