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MessageBox.Show(cc.GetCookies(st)[0].ToString()); // Proverka

 string reqString = "Login=vasyapupkin&Domain=mail.ru&Password=123456";

using System.Net;
using System.Text;
using System;
using System.Windows.Forms;

namespace mail
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }

        string thURI = "https://auth.mail.ru/cgi-bin/auth";
        string Login = "vasyapupkin";
        string Domain = "mail.ru";
        string Password = "12345";

        private void button1_Click(object sender, EventArgs e)
        {
            StringBuilder msg = new StringBuilder(String.Empty);
            Uri st = new Uri("http://www.mail.ru");
            string reqString = String.Format("Login={0}&Domain={1}&Password={2}",Login,Domain,Password);
            byte[] requestData = Encoding.UTF8.GetBytes(reqString);
            CookieContainer cc = new CookieContainer();
            var request = (HttpWebRequest)WebRequest.Create(thURI);
            request.Proxy = null;
            request.CookieContainer = cc;
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            using (System.IO.Stream s = request.GetRequestStream())
                s.Write(requestData, 0, requestData.Length);
            using (var response = (HttpWebResponse)request.GetResponse())
            {
                foreach (var str in cc.GetCookies(st))
                {
                    msg.Append(str);
                }
                MessageBox.Show(msg.ToString()); // Proverka
            }
        }
    }
}