The problem may be with Gmail, not the form - they have very strict spam filters. Do you have a non-Gmail address you can try sending to? Another user on the forums had the same issue recently - the emails wouldn't send to Gmail but would send to other email accounts. Also, there was a post a few years ago with the same issue which Ray replied to, so may be worth trying: https://www.webassist.com/forums/posts.php?id=45248