phpmailer 发邮件有关问题 , 服务器连接不下

//phpmailer类require_once("./plugin/phpmailer/class.phpmailer.php");require_once("./plugin/phpmailer/class.smtp.php");//自己写的functionfunction SendMailToClient($client){    $mail = new PHPMailer();        $mail->IsSMTP();    $mail->SMTPAuth = true;         // 设置为安全验证方式    $mail->Host     = "smtp.qq.com";        // SMTP服务器地址    $mail->Username = "[email protected]";      // 登录用户名    $mail->Password = "psw";               // 登录密码        $mail->From = "[email protected]";        // 发件人地址([email protected])    $mail->FromName = "发件人名称";        $mail->WordWrap   = 50;    $mail->IsHTML(true);            // 是否支持html邮件，true 或false               $mail->AddAddress("$client");        //客户邮箱地址    $mail->Subject = "标题";    $mail->Body    = "文本内容";    if(!$mail->Send()){       echo "Message could not be sent. <p>";       echo "Mailer Error: " . $mail->ErrorInfo;       return FALSE;    }    return TRUE;}//方法调用$client = "[email protected]";SendMailToClient($client);