Smtp email not client delivery fail.

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C#3.5

email

SmtpClient

Hi y'all,

I have an issue with a simple email client, the code works fine. However, the message is not delivered into Gmail/Hotmail inbox. I was wondering if I need to write the code into ASP.NET instead of WinForms project. Here's the code below, please advise.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net.Mail;


namespace Email_Client
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            try
            {

                SmtpClient client = new SmtpClient();
                //client.Port = 25;
                client.Port = 465;
               // client.Host = "smtp.live.com";
                client.Host = "smtp.gmail.com";
                client.EnableSsl = true;
                client.Timeout = 100000;
                client.DeliveryMethod = SmtpDeliveryMethod.Network;
                client.UseDefaultCredentials = false;
                client.EnableSsl = true;
                client.Credentials = new System.Net.NetworkCredential("sener_email", "password");

                MailMessage mm = new MailMessage("sender_email", "recipient_email ", "Subject", "Body");
                mm.IsBodyHtml = true;
                mm.BodyEncoding = UTF8Encoding.UTF8;
                mm.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;

                client.Send(mm);
                label1.Text = "Message sent..";
            }
            catch (Exception e)
            {
                label1.Text = e.ToString();
            }

        }
               
    }
}

Thanks,

What I have tried:

I have tried to change the SMTP server between Gmail and Hotmail, but the results the same. No messages were received.