Exceeded timeout trying to send email c# windows Forms

Question

I’m trying to create an application to send emails of "I forgot the password" but without success so far I posted here a problem where the screen was freezing and it was time exceeded application, I was indicated to use background worker, so I’m using it now but even then the application still gives error in the exceeded time limit and does not send anything, not even the progress bar does anything. NOTE: I changed the password and email fields of the email sending function for obvious reasons. Follows the code.

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;
using MySql.Data.MySqlClient;
using System.Net;

namespace Inicio
{
    public partial class Email : Form
    {
        MySqlConnection con = new MySqlConnection(@"Data Source=localhost;port=3306;Initial Catalog=digital wallet;User ID=root;password=");
        public Email()
        {
            InitializeComponent();
        }

        struct DataParameter
        {
            public int Process;
            public int Delay;
        }

        private DataParameter _inputparameter;

        private void SendEmail()
        {

            if (textBox1.Text == "" || textBox2.Text == "")
            {
                MessageBox.Show("Preencha todos os campos", "Erro",
                MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            else
            {

                int i = 0;
                con.Open();
                MySqlCommand cmd = con.CreateCommand();
                cmd.CommandType = CommandType.Text;
                cmd.CommandText = "select EMAIL from conta where EMAIL = @email  and LOGIN = @login ";
                cmd.Parameters.AddWithValue("@email", textBox2.Text);
                cmd.Parameters.AddWithValue("@login", textBox1.Text);
                cmd.ExecuteNonQuery();
                DataTable dt = new DataTable();
                MySqlDataAdapter da = new MySqlDataAdapter(cmd);
                da.Fill(dt);
                i = Convert.ToInt32(dt.Rows.Count.ToString());

                if (i == 0)
                {
                    MessageBox.Show("Login ou email inválidos", "Erro",
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                else
                {
                    cmd.CommandText = "select * from CONTA where LOGIN = @login";
                    cmd.ExecuteNonQuery();

                    string senha = "";
                    string email = "";

                    MySqlDataReader reader = cmd.ExecuteReader();
                    while (reader.Read())
                    {
                        senha = reader.GetString("SENHA");
                        email = reader.GetString("EMAIL");
                    }

                    reader.Close();

                    using (SmtpClient smtp = new SmtpClient())
                    {
                        smtp.Host = "outlook.com";
                        smtp.UseDefaultCredentials = false;
                        NetworkCredential netCred = new NetworkCredential("email", "senha");
                        smtp.Credentials = netCred;
                        smtp.EnableSsl = true;

                        using (MailMessage msg = new MailMessage("email", email))
                        {
                            msg.Subject = "Recuperação de senha.";
                            StringBuilder sb = new StringBuilder();
                            sb.AppendLine("A sua senha é atual é: " + senha  + Environment.NewLine);
                            sb.AppendLine("Obrigado," + Environment.NewLine);
                            sb.AppendLine("Digital wallet. " + Environment.NewLine);
                            msg.Body = sb.ToString();
                            msg.IsBodyHtml = false;
                            smtp.Send(msg);
                        }
                    }
                }
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            if (!backgroundWorker1.IsBusy)
            {
                _inputparameter.Delay = 100;
                _inputparameter.Process = 1200;
                backgroundWorker1.RunWorkerAsync(_inputparameter);
             }
         }

        private void button2_Click(object sender, EventArgs e)
        {
          if (!backgroundWorker1.IsBusy)
        {
                backgroundWorker1.CancelAsync();
        }
           this.Close();
        }

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            int process = ((DataParameter)e.Argument).Process;
            int delay = ((DataParameter)e.Argument).Delay;
            int index = 1;
            try
            {
                for (int i = 0; i < process; i++)
                {
                    if (!backgroundWorker1.CancellationPending)
                    {
                        backgroundWorker1.ReportProgress(index++ * 100 / process, string.Format("Process Data {0}", i));
                        SendEmail();
                    }
                }
            }
            catch(Exception ex)
            {
                backgroundWorker1.CancelAsync();
                MessageBox.Show(ex.Message, "Mensagem", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            progressBar1.Value = e.ProgressPercentage;
            label3.Text = string.Format("Processando...{0}%", e.ProgressPercentage);
            progressBar1.Update();
        }

        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            MessageBox.Show("Email enviado.", "Mensagem", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
    }
}

Answer 1

The problem may be related to the configuration of your Smtpclient, you may need to define the sending mode and port for SSL. I use the following method for sending e-mail

 string _sender;
 string _password;
 public void SendMail(string destino, string subject, string message)
 {
     SmtpClient smtp = new SmtpClient("smtp-mail.outlook.com");

     smtp.Port = 587;
     smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
     smtp.UseDefaultCredentials = false;
     System.Net.NetworkCredential credentials =
     new System.Net.NetworkCredential(_sender, _password);
     smtp.EnableSsl = true;
     smtp.Credentials = credentials;

     try
     {
       var mail = new MailMessage(_sender.Trim(), destino.Trim());
       mail.Subject = subject;
       mail.Body = message;
       smtp.Send(mail);
     }
     catch (Exception ex)
     {
       Console.WriteLine(ex.Message);
       throw ex;
     }
   }

It is also necessary to enable the sending of e-mail, in the e-mail referring to the sending