It seems that as long as the PHP file is named
send_form_email.php (case matters)
and is in the “dev” folder you should be seeing
Thank you for contacting us. We will be in touch with you very soon.
if the PHP sends it off to the mail server.
Whether or not the email server is sending it to your email, and whether or not your email client is rejecting it or sending it to your Trash box is another story.