Ver 4.4.15 Notifications.SendEmail Faild, please help

Hello,

I have the below code, which works fine for a long time, until this Monday 24 Oct. 2022

using System;
using System.Linq;
using System.Globalization;
using cAlgo.API;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;
using cAlgo.Indicators;

namespace cAlgo.Robots
{
    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]
    public class TestBot : Robot

    {
    
        protected override void OnStart()
        {

            //Test Email Function
            string sSubject =  "Symbol.Name + X"; 
            string sMessage = Bars.LastBar.Close + " ↘↘↘ " + Server.Time.AddHours(0).ToString("HH:mm:ss"); 
            Notifications.SendEmail("xxx@icloud.com", "xxx@hotmail.com", sSubject, sMessage);

        }

    }

}

The error code is below screenshot, which happens in version 4.4.15.9791, and was downloaded from Spotware directly. I'm sure the email setting has no problem. Please advise. Thanks.