ถามเรื่องการใช้ฟังก์ชั่น group_concat ครับ ให้ดึงอีเมล์มาแล้วส่งเมล์ไปหลายๆคน

<?
$objConnect = mysql_connect("localhost","root","1234") or die("Error Connect to Database");
$objDB = mysql_select_db("customer");
$strSQL = "SELECT * FROM customer   ";
$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
while($objResult = mysql_fetch_array($objQuery))
{

	$strTo = $objResult["Email"];
	$strSubject = "Test Send Email";
	$strHeader = "Content-type: text/html; charset=windows-874\n"; // or UTF-8 //
	$strHeader .= "From: apinya \nReply-To: [email protected]";
	$strVar = "My Message";
	$strMessage = "
	<h1>My Message</h1><br>
	<table width='285' border='1'>
	<tr>
	<td><div align='center'><strong>My Message </strong></div></td>
	<td><div align='center'><font color='red'>My Message</font></div></td>
	<td><div align='center'><font size='2'>My Message</font></div></td>
	</tr>
	<tr>
	<td><div align='center'>My Message</div></td>
	<td><div align='center'>My Message</div></td>
	<td><div align='center'>My Message</div></td>
	</tr>
	<tr>
	<td><div align='center'>".$strVar."</div></td>
	<td><div align='center'>".$strVar."</div></td>
	<td><div align='center'>".$strVar."</div></td>
	</tr>
	</table>";

	@mail($strTo,$strSubject,$strMessage,$strHeader); // @ = No Show Error //
}
?>