I have a problem In Mail Function

Hi In a web application I need to send mail for each members whith a different content . mail message must be in HTML Format and 1256 code page I call mail() functoin in a simple loop to send multiple mail message with differrent content. now I want know that is any body know better method to do it ?? but I have bigest problem when I send message to yahoo mail server ,yahoo rout my message to bulk mail and I cant solve this problem please tell me if you have know solution. my send mail is come below: function send_mail($to,$subject,$message){ $headers = "MIME-Version: 1.0\r\n"; $headers .= "Content-type: text/html; charset=windows-1256\r\n"; $headers .= "From: Me <mail@domain.com>\r\n"; $headers .= "Return-path: Me <mail@domain.com>\r\n"; $headers .= "Reply-To: Me <mail@domain.com>\r\n"; // $headers .= "Bcc: $to \r\n"; if (mail($to, $subject, $message, $headers)) print("$to Send Ok!<br>"); else print("<b>$to Send Problem</b>!<br>"); } thanks