How can I validate email in this PHP contact form? : <p>is there a way to validate an email in this form without rewriting it completely? It'd be great if I could just add something to this. I'm new to PHP and this form is taken from mmtuts video. If you know how to help, I'd be glad if you did.</p>

<pre><code>&lt;?php

if (isset($_POST['submit'])) {
    $name = $_POST['name'];
    $number = $_POST['number'];
    $subject = $_POST['subject'];
    $mailFrom = $_POST['mail'];
    $message = $_POST['message'];

    $mailTo = "misavoz@seznam.cz";
    $headers = "From: ".$mailFrom;
    $txt = "Pan/í ".$name." vám poslal/a zprávu. Telefonní číslo: ".$number."\n\n".$message;

    mail($mailTo, $subject, $txt, $headers);
    header("Location: index.php?mailsend");
}
</code></pre>
