zhangjingyu 
继续搜索“subject_replytouser_title”，
lib/forum/replypost.class.php文件部分代码：
    function sendMail() {
        global $db_msgreplynotice,$db_replysendmail,$db_replysitemail,$windid,$winduid;
        $ret = $msgNotice = 0;
        $this->data['content'] = preg_replace("/\[quote\](.*)\[\/quote\]/is","",$this->data['content']);
        if ($db_msgreplynotice && $this->replyToUser && $this->replyToUser != $windid) {
            M::sendMessage(
                $winduid,
                array($this->replyToUser),
                array(
                    'create_uid' => $winduid,
                    'create_username' => $windid,
                    'title' => getLangInfo('writemsg','subject_replytouser_title',array(
                        'windid'    => $windid,
                        'title'        => substrs(strip_tags($this->tpcArr['subject']), 30, 'Y')
                    )),
                    'content' => getLangInfo('writemsg','subject_reply_content',array(
                        'tid' => $this->tid,
                        'pid' => $this->pid,
                        'windid' => $windid,
                        'content'    => substrs(strip_tags($this->data['content']), 100, 'Y')
                    )),
                ),
                'sms_reply',
                'sms_reply'
            );
            $msgNotice = 1;
     &#