FORMAT AF E- MAIL (HTML / ANDEN)...

using System;
using System.IO;
using System.Net;
using System.Net.Sockets;

public class EMailDemo
{
    public static void EMail(string mailserver, string to, string from,
                            string subj, string body)
    {
        string ownhost = Dns.GetHostName();
        TcpClient client = new TcpClient(mailserver, 25);
        StreamWriter wrt = new StreamWriter(client.GetStream());
        wrt.WriteLine("HELO " + ownhost);
        wrt.WriteLine("MAIL FROM: <" + from + ">");
        wrt.WriteLine("RCPT TO: <" + to + ">");
        wrt.WriteLine("DATA");
        wrt.WriteLine("Return-Path: <" + from + ">");
        wrt.WriteLine("From: " + from);
        wrt.WriteLine("To: " + to);
        wrt.WriteLine("Subject: " + subj);
        wrt.WriteLine();
        wrt.WriteLine(body);
        wrt.WriteLine(".");
        wrt.WriteLine("QUIT");
        wrt.Flush();
        wrt.Close();
        client.Close();
    }
    public static void Main(string[] args)
    {
        EMail("192.168.1.10", "arne@arne", "arne@arne", "Test", "Dette er en test\r\nEn anden linie");
    }
}