Probleme erreur SQL

if(!empty($_POST['email']))
{
    $sql2 = 'SELECT COUNT (*) FROM membres WHERE email= "'.mysql_real_escape_string($_POST['email']).'"';
    $query2 = mysql_query($sql2) or die('Erreur SQL !<br />'.$sql2.'<br />'.mysql_error());
    $donnees2 = mysql_fetch_assoc($query2);
}

Erreur SQL !
SELECT COUNT (*) FROM membres WHERE email= "(mon email)"
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '*) FROM membres WHERE email= "(mon email)"' at line 1