//      Author: Bill Farley
//      Date: 4/8/2001
//      Time: 11:43:38 AM

//Compile: csc /r:System.Net.dll /r:System.IO.dll /r:message.dll /target:library SMTPMailer.cs
 
using System.Net.Sockets;
using System.IO;
using System.Net;
using System;

//Compile: csc /r:System.Net.dll /r:System.IO.dll /r:message.dll /target:library SMTPMailer.cs

public class SMTPMailer
{
    string SMTPServer;
    string host;

    public SMTPMailer(string server, string _host){
        SMTPServer = server;
        host = _host;
    }

    public void Send(Message msg)
    {
		TCPClient sender = new TCPClient(SMTPServer,25);
        Byte[] outbytes;
        string input;

        try{
			NetworkStream ns = sender.GetStream();
            StreamReader sr = new StreamReader(sender.GetStream() );
			sr.ReadLine();

            input = "HELO " + host + "\r\n";
            outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
			ns.Write(outbytes,0,outbytes.Length) ;
			sr.ReadLine();

            input = "MAIL FROM: " +"<" + msg.From + ">" + "\r\n";
            outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
			ns.Write(outbytes,0,outbytes.Length) ;
			sr.ReadLine();

            input = "RCPT TO: " + "<" + msg.To + ">" + "\r\n";
            outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
			ns.Write(outbytes,0,outbytes.Length) ;
			sr.ReadLine();

            input = "DATA" + "\r\n";
            outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
			ns.Write(outbytes,0,outbytes.Length) ;
			sr.ReadLine();

            input ="Subject: " + msg.Subject + "\r\n" + msg.Body + "\r\n" + "." + "\r\n";
            outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
			ns.Write(outbytes,0,outbytes.Length) ;
			sr.ReadLine();

            input ="QUIT" + "\r\n";
            outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
			ns.Write(outbytes,0,outbytes.Length) ;
			sr.ReadLine();

            sr.Close();
            ns.Close();
        }
		catch(InvalidOperationException ioe){
			Console.WriteLine(ioe.ToString() );
			Console.WriteLine("Could not connect to mail server");
		}
    }
}