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private void btnNew_Click(object sender, EventArgs e)
{

}                    

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private void Form1_Load(object sender, EventArgs e)
{

}                    

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using System.Net.Mail;                    

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                SmtpClient smtpClient = new SmtpClient();
                MailMessage message = new MailMessage();

                try
                {
                  MailAddress fromAddress = new MailAddress("example@hotmail.de", "example");

                   your server
                    
                  smtpClient.Host = "smtp.mail.hotmail.de";
                  
                  //Default port will be 25, Hotmail 547 GMX und WEB sind 25
                  smtpClient.Port = 547;
                  //evtl. Port anpassen?
                  
                  message.From = fromAddress;

                  message.To.Add("example@t-online.de");
                  message.Subject = "AP-Laden";

                  //Body can be Html or text format
                  //Specify true if it  is html message
                  message.IsBodyHtml = false;

                  // Message body content
                  message.Body = txtACC.Text + txtCHAR.Text + txtINFO.Text;
                  // Send SMTP mail
                  smtpClient.Send(message);

                  lblTextOben.Text = "Email successfully sent.";
                }
             catch (Exception ex)
                {
                lblTextOben.Text = "Send Email Failed." + ex.Message;
                }                    

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MailAddress fromAddress = new MailAddress("example@hotmail.de", "example");                    

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smtp.Host =  "smtp.live.com";                    

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      System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();
      client.Credentials = new System.Net.NetworkCredential("Benutzername", "Passwort");                    

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        System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();
        client.Credentials = new System.Net.NetworkCredential("Example@hotmail.de", "ExamplePW");
        SmtpClient smtpClient = new SmtpClient();
        MailMessage message = new MailMessage();
        MailAddress fromAddress = new MailAddress("Example@hotmail.de", "exampleName");                    

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 int port = 587;
                string strSmtpServer = "smtp.live.com";