should be:
if (filter_var($_POST['Youremail'], FILTER_VALIDATE_EMAIL)) {
$email = $_POST['Youremail'];
} else $validationOK = false;
for name it depends on what characters you are prepared to accept as part of a valid name
should be:
if (filter_var($_POST['Youremail'], FILTER_VALIDATE_EMAIL)) {
$email = $_POST['Youremail'];
} else $validationOK = false;
for name it depends on what characters you are prepared to accept as part of a valid name