yahoo route my mail's to bulk folder

hi and thank's my friend's in a web application I send mail message to members using mail() function in HTML format but yahoo mail server route my messages to bulk folder , I want know if there is any setting requiered in my script to send mail correctly, PHPINFO() function return sendmail_from = me@localhost.com sendmail_path = /usr/sbin/sendmail -t -i Path to sendmail = /usr/sbin/sendmail -t -i I send my mail useing function below: please tell me if you know better method to send mime mail 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>"); } best regards