C#的简单的邮件发送和接收

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

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

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{

// 发送邮件
//MailAddress from = new MailAddress("arfornet@gmail.com");
//MailAddress to = new MailAddress("swang@tekdigitel.com");
//MailMessage message = new MailMessage(from, to);
//message.Subject = "test";
//message.Body = "IP地址:";
//message.IsBodyHtml = true;
//message.SubjectEncoding = System.Text.Encoding.Default;
//message.BodyEncoding = System.Text.Encoding.Default;

//SmtpClient client = new SmtpClient("smtp.gmail.com");
//System.Net.NetworkCredential smtpuserinfo = new System.Net.NetworkCredential();
//smtpuserinfo.UserName = "arfornet@gmail.com";
//smtpuserinfo.Password = "a8r3f8o7r6n1e5t8";
//client.Credentials = smtpuserinfo;
//client.EnableSsl = true;//这里是服务器要求验证
//client.Send(message);
//MessageBox.Show("victory");

POP pop3 = new POP("E-Mail.Server", "UserName", "PassWord");
Console.WriteLine("New Messages = {0}", pop3.GetNumberOfNewMessages());
Console.ReadLine();

}
}

class POP
{
string POPServer;
string user;
string pwd;
public POP() { }
public POP(string _popserver, string _user, string _pwd)
{
POPServer = _popserver;
user = _user;
pwd = _pwd;
}
private NetworkStream Connect()
{
TcpClient sender = new TcpClient(POPServer, 110);
Byte[] outbytes;
string input;
NetworkStream ns = null;
try
{
ns = sender.GetStream();
StreamReader sr = new StreamReader(ns);
Console.WriteLine("1:" + sr.ReadLine());

input = "user " + user + "/r/n";
outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
ns.Write(outbytes, 0, outbytes.Length);
Console.WriteLine("2:" + sr.ReadLine());

input = "pass " + pwd + "/r/n";
outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
ns.Write(outbytes, 0, outbytes.Length);
Console.WriteLine("3:" + sr.ReadLine());

return ns;
}
catch (InvalidOperationException ioe)
{
Console.WriteLine("Could not connect to mail server");
return ns;
}
}
public int GetNumberOfNewMessages()
{
Byte[] outbytes;
string input;
try
{
NetworkStream ns = Connect();
StreamReader sr = new StreamReader(ns);

input = "stat" + "/r/n";
outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
ns.Write(outbytes, 0, outbytes.Length);
string resp = sr.ReadLine();
Console.WriteLine("4:" + resp);
string[] tokens = resp.Split(new Char[] { ' ' });

input = "quit" + "/r/n";
outbytes = System.Text.Encoding.ASCII.GetBytes(input.ToCharArray());
ns.Write(outbytes, 0, outbytes.Length);
Console.WriteLine("5:" + sr.ReadLine());

sr.Close();
ns.Close();
//return tokens[1].ToInt32();
return Convert.ToInt32(tokens[1]);
}
catch (InvalidOperationException ioe)
{
Console.WriteLine("Could not connect to mail server");
return 0;
}
}
}

}