用thinkPHP的Smail.class.php发邮件报错，联接服务器失败49
哪位打算告诉我原因
$sm = new \Think\Smail("342344@qq.com","rong","smtp.qq.com");
$end = $sm->send("113704@qq.com","342344@qq.com","这个是标题","这个是内容");
if($end) echo $end;