ho fatto una cosa al volo dovrebbe funzionare

Codice PHP:
<?php
function is_email($email_to_test)
    {
        $re  = "^([a-zA-Z0-9])+([\.a-zA-Z0-9_-])*@([a-zA-Z0-9_-])";
        $re .= "+(\.[a-zA-Z0-9_-]+)*\.([a-zA-Z]{2,6})$";
        if (ereg($re, $email_to_test))
        {
            return TRUE;
        }
        else
        {
            return FALSE;
        }
    }

if(isset($_POST['submit'])){
    $nome = trim($_POST['nome']);
    $email = trim($_POST['email']);
    if($email == "" or (is_email("$email") == TRUE)){
       
                        $to = $email;
            $subject = "$name ti vuol far conoscere un sito ";
            $headers  = 'MIME-Version:1.0'."\r\n";
            $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
            $headers .= 'From: [email]miaemail@email.it[/email]' . "\r\n";
            $message ="
            <html><body>
            Ciao sono $nome:<br \>
                        Volevo farti conoscere questo sito [url]http://miosito.it[/url]
                        Io l'ho trovato molto interessante
            </body></html>
            ";
            mail($to,$subject,$message,$headers);
            echo"Email Inviata";
                
            
            }else{
                        echo"Email Inserita Non Valida
<a href=\"suggerisci.php\">Riprova</a>";
                    }
        
    }else{
    
    
    
    


?>
<html>
    <head>
        <title>Suggerisci Sito</title>
        <style type="text/css">
        label{display:block;}
        </style>
    </head>
    <body>
        <form method="post" action="">
            <label>Suggerisci Questo Sito</label>
            <label>Tuo Nome</label>
            <input type="text" name="nome" />
            <label>Email Amico</label>
            <input type="text" name="email" />
            <input type="submit" name="submit" value="Suggerisci" />
        </form>    
<?php
}
?>        
        
    </body>
    
    
</html>