Warum durchläuft die schleife das nur einmal?

if ($submit) {
	echo "SQL: SELECT * FROM gc_gewinnspiel_eins WHERE vorname IN ('$xlist') ORDER by nr ASC 
";
	$xresult = mysql_query("SELECT * FROM gc_gewinnspiel_eins WHERE vorname IN ('$xlist') ORDER by nr ASC");
	if(!$xresult){
		echo "Fehler: ".mysql_error()."
";
	}
	echo "Results: ".mysql_num_rows($xresult)."
";
	while($row = mysql_fetch_array($xresult)) {
		echo  "-> Mail an $row[email]\n";
	$header = "From: GERMAN CLUB COMMUNITY <communitydesk@germanclub.de>\n";
	$header .= "Reply-To: [email]communitydesk@germanclub.de[/email]\n";
	$header .= "Content-Type: text/html\r\nContent-Transfer-Encoding: 8bit\r\n";
	$header .= "X-Mailer: PHP ". phpversion();
	mail("$row[email]", "DU HAST BEIM GERMAN CLUB COMMUNITY GEWINNSPIEL GEWONNEN","


	</body>
	</html>
	","$header");
	} 
};
?>