电子邮件未发送功能codeigniter php mailer

Question

此控制器代码。 我发现“无法发送密码，请重试！”的问题。 。 我该怎么办？

    $mail_message='Dear '.$row[0]['name'].','. "\r\n";
    $mail_message.='Your <b>Password</b> is <b>'.$passwordplain.'</b>'."\r\n";
    $mail_message.='<br>Please Update your password.';
    $mail_message.='<br>Thanks & Regards';
    $mail_message.='<br>IT Ardiles';
    $mail = new PHPMailer;
    $mail->IsSendmail();
    $mail->isSMTP();
    $mail->SMTPAuth = true;
    $mail->SMTPSecure = '';                           
    $mail->Port = 587;
    $mail->Host = "mail.xxxxx.co.id";
    $subject = 'Forgot Password';
    $mail->AddAddress(xxx@xxxxx.co.id);
    $mail->IsMail();
    $mail->From = 'it@xxxxx.co.id';
    $mail->Password = 'xxxxx';
    $mail->FromName = 'IT';
    $mail->IsHTML(true);
    $mail->Subject = $subject;
    $mail->Body    = $mail_message;
    $mail->Send();