note 9914 added to mail

After I use below code to send a combined text/plain and text/html email, I receive mail that show good style from mailbox of Netscape. But I receive mail that do not show correct style from OutLook Express or OutLook. <? $body="\r\ng--c0p4Jq0M2Yt08j34c0pContent-Type: text/plain; charset=us-ascii; format=flowed\r\nContent-Transfer-Encoding: 7bit\r\n\r\n$textbody\r\n\r\n--gc0p4Jq0M2Yt08j34c0p\r\nContent-Type: text/html; charset=us-ascii;\r\nContent-Transfer-Encoding: 7bit\r\n\r\n$htmlbody\r\n"; mail("$to","$subject",$body,"Mime-Version: 1.0\r\nFrom: $from\r\nReply-To: $replyto\r\nContent-Type: multipart/alternative;\r\n boundary=gc0p4Jq0M2Yt08j34c0p\r\n"); ?> http://www.php.net/manual/function.mail.php