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                    Mail myMail = new Mail();
                    myMail.Subject = "Testbetreff";
                    myMail.MailTo = "daniel@fischbach-kassel.de;daniel@fischbach-kassel.de";
                    myMail.Body = "Testinhalt";
                    if (Global.SendMail(myMail))

                    ....                    

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        public static bool SendMail(Mail mail)
        {
            //TODO: Absenderinformationen über Optionen abbilden
            try
            {
                if (mail.Body != string.Empty)
                {
                    System.Net.Mail.SmtpClient myMail = new System.Net.Mail.SmtpClient();


                    System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();

                    msg.From = new MailAddress("daniel@fischbach-kassel.de");

                    string[] mailAddresses = mail.MailTo.Split(";".ToCharArray());

                    foreach (string mailAddress in mailAddresses)
                    {
                        if (mailAddress != String.Empty)
                        {
                            msg.To.Add(mailAddress);
                        }
                    }

                    msg.Subject = mail.Subject;
                    msg.Body = mail.Body;

                    if ((mail.Attachment != string.Empty) && (File.Exists(mail.Attachment)))
                    {
                        Attachment MyAttachment = new Attachment(mail.Attachment);
                        msg.Attachments.Add(MyAttachment);
                    }

                    myMail.Credentials = new NetworkCredential("xxx", "xxx");
                    myMail.Host = "smtp.1und1.de";
                    myMail.Send(msg);
              }

}                    

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private void SendMail(string Absender, string Empfänger, string Betreff, string InhaltDerMail, string SmtpServer, string Benutzername, string Passwort)
        {
            MailMessage myMessage = new MailMessage(Absender, Empfänger, Betreff, InhaltDerMail);
            SmtpClient client = new SmtpClient(SmtpServer);
            client.Port = 578;
            client.Credentials = new System.Net.NetworkCredential(Benutzername, Passwort);
            client.EnableSsl = true;
            client.Send(myMessage);
        }