using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Mail;
using System.Net.Mime;
using System.Web;

namespace WindowsFormsApplication8
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            SmtpClient S = new SmtpClient("pop3.rambler.ru", 587);
            S.Credentials = new NetworkCredential("ИМЯ", "Password");
            MailMessage M = new MailMessage();
            M.From = new MailAddress("ИМЯ@rambler.ru");
            M.To.Add(new MailAddress("ИМЯ@rambler.ru"));
            M.Subject = " ПРОВЕРКА";
            M.Body = "Привет !!!";
            S.Send(M);            
        }
    }
}