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

SmtpClient smtp = new SmtpClient();
                MailAddress from = new MailAddress(Sender-E-Mail-Adresse);
                MailAddress to = new MailAddress(Empfänger-E-Mail-Adresse);
                MailMessage mes = new MailMessage(from.Address, to.Address,
                "Dies ist eine Testnachricht", "");
                smtp.Host = "smtp.web.de";
                System.Net.NetworkCredential credentials = new System.Net.NetworkCredential();
                credentials.Password = Passwort;
                credentials.UserName = E-Mailaccount-Name;
                smtp.Credentials = credentials;
                smtp.Send(mes);