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using System;
using System.IO;
using System.Web;
using System.Net.Mail;

namespace mailtest
{
    class Program
    {
        public static void Main(string[] args)
        {
            MailMessage Message = new MailMessage();
                    string test = "test";
                    Message.From = test;
                    Message.To = "fendalex@vol.at";
                    Message.Subject = "test";
                    Message.Body = "test";
                    Message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");//basic authentication
                    Message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "my_username_here"); //set your username here
                    Message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "super_secret");//set your password here

                    Console.WriteLine("E-Mail übertragen...");
                    SmtpMail.SmtpServer = "pop.gmx.net";
                    SmtpMail.Send(Message);
                    Console.WriteLine("E-Mail wurde übertragen.");
                    Console.Read();

        }
    }
}                    

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public static void Main(string[] args)
        {
            MailMessage Message = new MailMessage();
                    string test = "test";
                    Message.From = test;
                    Message.To = "a.f@vol.at";
                    Message.Subject = "test";
                    Message.Body = "test";
                    Message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");//basic authentication
                    Message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "user"); //set your username here
                    Message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "pass");//set your password here

                    Console.WriteLine("E-Mail übertragen...");
                    SmtpMail.SmtpServer = "pop.vol.at";
                    SmtpMail.Send(Message);
                    Console.WriteLine("E-Mail wurde übertragen.");
                    Console.ReadLine();

        }                    

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            MailMessage msg = new MailMessage();
            msg.From = new MailAddress("EMail1");
            msg.To.Add(new MailAddress("EMail2"));
            msg.Subject = "Testmail";
            msg.Body = "Dies ist eine Testmail";

            SmtpClient client = new SmtpClient();
            client.Host = "Mailserver";
            client.Credentials = new NetworkCredential("Benutzername", "Passwort");
            client.Send(msg);                    

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using System;
using System.IO;
using System.Net;
using System.Net.Mail;

namespace teset
{
  class Program
  {
    public static void Main(string[] args)
    {
      MailMessage msg = new MailMessage();
            msg.From = new MailAddress("EMail1@test.de");
            msg.To.Add(new MailAddress("f.a@vol.at"));
            msg.Subject = "Testmail";
            msg.Body = "Dies ist eine Testmail";

            SmtpClient client = new SmtpClient();
            client.Host = "pop.vol.at";
            client.Credentials = new NetworkCredential("user", "pass");
            client.Send(msg);
    }
  }
}