Csharp/C Sharp/Network/Mail

A POP3 e-mail checker

/*
C# Network Programming 
by Richard Blum
Publisher: Sybex 
ISBN: 0782141765
*/
using System;
using System.Drawing;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;
public class PopCheck : Form
{
   private TextBox hostname;
   private TextBox username;
   private TextBox password;
   private TextBox status;
   private ListBox messages;
   private TcpClient mailclient;
   private NetworkStream ns;
   private StreamReader sr;
   private StreamWriter sw;
   public PopCheck()
   {
      Text = "popcheck - A POP3 e-mail checker";
      Size = new Size(400, 380);
      Label label1 = new Label();
      label1.Parent = this;
      label1.Text = "Hostname:";
      label1.AutoSize = true;
      label1.Location = new Point(10, 33);
      hostname = new TextBox();
      hostname.Parent = this;
      hostname.Size = new Size(200, 2 * Font.Height);
      hostname.Location = new Point(75, 30);
      Label label2 = new Label();
      label2.Parent = this;
      label2.Text = "User name:";
      label2.AutoSize = true;
      label2.Location = new Point(10, 53);
      username = new TextBox();
      username.Parent = this;
      username.Size = new Size(200, 2 * Font.Height);
      username.Location = new Point(75, 50);
      Label label3 = new Label();
      label3.Parent = this;
      label3.Text = "Password:";
      label3.AutoSize = true;
      label3.Location = new Point(10, 73);
      password = new TextBox();
      password.Parent = this;
      password.PasswordChar = "*";
      password.Size = new Size(200, 2 * Font.Height);
      password.Location = new Point(75, 70);
      Label label4 = new Label();
      label4.Parent = this;
      label4.Text = "Status:";
      label4.AutoSize = true;
      label4.Location = new Point(10, 325);
     
      status = new TextBox();
      status.Parent = this;
      status.Text = "Not connected";
      status.Size = new Size(200, 2 * Font.Height);
      status.Location = new Point(50, 322);
      messages = new ListBox();
      messages.Parent = this;
      messages.Location = new Point(10, 108);
      messages.Size = new Size(360, 16 * Font.Height);
      messages.DoubleClick += new EventHandler(getmessagesDoubleClick);
      Button login = new Button();
      login.Parent = this;
      login.Text = "Login";
      login.Location = new Point(295, 32);
      login.Size = new Size(5 * Font.Height, 2 * Font.Height);
      login.Click += new EventHandler(ButtonloginOnClick);
      Button close = new Button();
      close.Parent = this;
      close.Text = "Close";
      close.Location = new Point(295, 62);
      close.Size = new Size(5 * Font.Height, 2 * Font.Height);
      close.Click += new EventHandler(ButtoncloseOnClick);
    }
   void ButtonloginOnClick(object obj, EventArgs ea)
   {
      status.Text = "Checking for messages...";
      Thread startlogin = new Thread(new ThreadStart(loginandretr));
      startlogin.IsBackground = true;
      startlogin.Start();
   }
   void ButtoncloseOnClick(object obj, EventArgs ea)
   {
      if (ns != null)
      {
         sw.Close();
         sr.Close();
         ns.Close();
         mailclient.Close();
      }
      Close();
   }
   void loginandretr()
   {
      string response;
      string from = null;
      string subject = null;
      int totmessages;
      try
      {
         mailclient = new TcpClient(hostname.Text, 110);
      } catch (SocketException)
      {
         status.Text = "Unable to connect to server";
         return;
      }
      ns = mailclient.GetStream();
      sr = new StreamReader(ns);
      sw = new StreamWriter(ns);
      response = sr.ReadLine(); //Get opening POP3 banner
      sw.WriteLine("User " + username.Text); //Send username
      sw.Flush();
      response = sr.ReadLine();
      if (response.Substring(0,4) == "-ERR")
      {
         status.Text = "Unable to log into server";
         return;
      }
      sw.WriteLine("Pass " + password.Text);  //Send password
      sw.Flush();
      try
      {
         response = sr.ReadLine();
      } catch (IOException)
      {
         status.Text = "Unable to log into server";
         return;
      }
      if (response.Substring(0,3) == "-ER")
      {
         status.Text = "Unable to log into server";
         return;
      }
      sw.WriteLine("stat"); //Send stat command to get number of messages
      sw.Flush();
      response = sr.ReadLine();
      string[] nummess = response.Split(" ");
      totmessages = Convert.ToInt16(nummess[1]);
      if (totmessages > 0)
      {
         status.Text = "you have " + totmessages + " messages";
      } else
      {
         status.Text = "You have no messages" ;
      }
      for (int i = 1; i <= totmessages; i++)
      {
         sw.WriteLine("top " + i + " 0"); //read header of each message
         sw.Flush();
         response = sr.ReadLine();
         while (true)
         {
            response = sr.ReadLine();
            if (response == ".")
               break;
            if (response.Length > 4)
            {
               if (response.Substring(0, 5) == "From:")
                  from = response;
               if (response.Substring(0, 8) == "Subject:")
                  subject = response;
            }
         }
         messages.Items.Add(i + "  " + from + "  " + subject);
      }
   }
   void getmessagesDoubleClick(object obj, EventArgs ea)
   {
      string text = (string)messages.SelectedItem;
      string[] textarray = text.Split(" ");
      ShowMessage sm = new ShowMessage(ns, textarray[0]);
      sm.ShowDialog();
   }
   public static void Main()
   {
      Application.Run(new PopCheck());
   }
}
class ShowMessage : Form
{
   public ShowMessage(NetworkStream ns, string messnumber)
   {
      StreamReader sr = new StreamReader(ns);
      StreamWriter sw = new StreamWriter(ns);
      string response;
      Text = "Message " + messnumber;
      Size = new Size(400, 380);
      ShowInTaskbar = false;
      TextBox display = new TextBox();
      display.Parent = this;
      display.Multiline = true;
      display.Dock = DockStyle.Fill;
      display.ScrollBars = ScrollBars.Both;
      sw.WriteLine("retr " + messnumber); //Retrieve entire message
      sw.Flush();
      response = sr.ReadLine();
      while (true)
      {
         response = sr.ReadLine();
         if (response == ".")
            break;
         display.Text += response + "\r\n";
      }
   }
}

Fancy Mail Test

/*
C# Network Programming 
by Richard Blum
Publisher: Sybex 
ISBN: 0782141765
*/
using System;
using System.Web.Mail;
public class FancyMailTest
{
   public static void Main()
   {
      MailMessage mm = new MailMessage();
      mm.From = "haley@myisp.net";
      mm.To = "riley@yourisp.net;rich@shadrach.ispnet1.net";
      mm.Cc = "matthew@anotherisp.net;chris@hisisp.net";
      mm.Bcc = "katie@herisp.net;jessica@herisp.net";
      mm.Subject = "This is a fancy test message";
      mm.Headers.Add("Reply-To", "haley@myisp.net");
      mm.Headers.Add("Comments", "This is a test HTML message");
      mm.Priority = MailPriority.High;
      mm.BodyFormat = MailFormat.Html;
      mm.Body = "<html><body><h1>This is a test message</h1><h2>This message should have HTML-type formatting</h2>Please use an HTML-capable viewer.";
      try
      {
         SmtpMail.Send(mm);
      } catch (System.Web.HttpException)
      {
         Console.WriteLine("This device is unable to send Internet messages");
      }
   }
}

Mail Attach Test

/*
C# Network Programming 
by Richard Blum
Publisher: Sybex 
ISBN: 0782141765
*/
using System;
using System.Web.Mail;
public class MailAttachTest
{
   public static void Main()
   {
      MailAttachment myattach =
          new MailAttachment("c:\\temp\\MailAttachTest.exe", MailEncoding.Base64);
      MailMessage newmessage = new MailMessage();
      newmessage.From = "barbara@shadrach.ispnet1.net";
      newmessage.To = "rich@shadrach.ispnet1.net";
      newmessage.Subject = "A test mail attachment message";
      newmessage.Priority = MailPriority.High;
      newmessage.Headers.Add("Comments",
                 "This message attempts to send a binary attachment");
      newmessage.Attachments.Add(myattach);
      newmessage.Body = "Here"s a test file for you to try";
      try
      {
         SmtpMail.SmtpServer = "192.168.1.100";
         SmtpMail.Send(newmessage);
      } catch (System.Web.HttpException)
      {
         Console.WriteLine("This device can not send Internet messages");
      }
   }
}

Mail Test

using System;
using System.Net;
using System.Web.Mail;
public class MailTest
{
   public static void Main()
   {
      string from = "from@from.net";
      string to = "to@to.net";
      string subject = "This is a test mail message";
      string body = "Hi .";
      SmtpMail.SmtpServer = "192.168.1.150";
      SmtpMail.Send(from, to, subject, body);
   }
}

SmtpClient: From, Subject, Body, Attachments, To

 
using System;
using System.Net;
using System.Net.Mail;
class MainClass {
    public static void Main(string[] args) {
        SmtpClient client = new SmtpClient("mail.somecompany.ru", 25);
        client.Credentials = new NetworkCredential("user@somecompany.ru", "password");
        using (MailMessage msg = new MailMessage()) {
            msg.From = new MailAddress("author@visual-csharp-recipes.ru");
            msg.Subject = "Greetings";
            msg.Body = "This is a  message.";
            msg.Attachments.Add(new Attachment("7.cs", "text/plain"));
            msg.Attachments.Add(new Attachment("7.exe", "application/octet-stream"));
            foreach (string str in args) {
                try {
                    msg.To.Add(new MailAddress(str));
                } catch (FormatException ex) {
                    Console.WriteLine("{0}: Error -- {1}", str, ex.Message);
                    continue;
                }
            }
            client.Send(msg);
        }
    }
}