I have send mail office outlook.
 Please help me solve it.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net;
using System.Net.Mail;
using System.Text;
public partial class Default12 : System.Web.UI.Page
{
    public class OutlookDotComMail
        {
            string _sender = "";
            string _password = "";
            string _domain = "";
            public OutlookDotComMail(string sender, string password)
            {
                _sender = sender;
                _password = password;
                
            }
            public void SendMail(string recipient, string subject, string message)
            {
                SmtpClient client = new SmtpClient();
                client.Host = "mail.globaltechnopartners.com";
                client.Port = 465;
                client.UseDefaultCredentials = false;
              //  client.DeliveryMethod = SmtpDeliveryMethod.Network;
                System.Net.NetworkCredential credentials =
                    new System.Net.NetworkCredential(_sender, _password, _domain);
                var creds = CredentialCache.DefaultCredentials;
                client.EnableSsl = true;
                client.Credentials = credentials;
              
                try
                {
                    var mail = new MailMessage(_sender.Trim(), recipient.Trim());
                    mail.Subject = subject;
                    mail.Body = message;
                    client.Send(mail);
                  
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                    throw ex;
                }
            }
            internal void SendMail(string email)
            {
                throw new NotImplementedException();
            }
        }
    protected void Page_Load(object sender, EventArgs e)
    {
        string mailuserpass = "*******";
        var sender1 = new OutlookDotComMail(mailuser, mailuserpass);
    }
}