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private string sendMail() {
  MailMessage mail = new MailMessage();

  mail.From = this.from;
  mail.To = this.to;
  mail.Cc = this.cc;
  mail.Bcc = this.bcc;

  if (this.highPriority == true) {      
    mail.Priority = MailPriority.High;
  }
  mail.Subject = this.subject);
  if (this.body.StartsWith("<") == false) {
    mail.BodyFormat = MailFormat.Text;
  } else {
    mail.BodyFormat = MailFormat.Html;
  }
  mail.Body = this.body;

  if (this.attachment != "") {
    string[] files = attachment.Split('|');
    int count = files.Length;
    for (int i = 0; i < count; i++) {
      MailAttachment ma = new MailAttachment(files[i], MailEncoding.Base64);
      mail.Attachments.Add(ma);
    }
  }
  string cdo = "http://schemas.microsoft.com/cdo/configuration";
  // Handle SMTP authentication
  if (this.smtpUsername != "") {
    if (this.smtpPassword != "") {
      mail.Fields.Add(cdo + "/smtpauthenticate", "1");
      mail.Fields.Add(cdo + "/sendusername", this.smtpUsername);
      mail.Fields.Add(cdo + "/sendpassword", this.smtpPassword);
    }
  }
  // Handle SMTP configuration
  if (this.smtpPort != "") {
    mail.Fields.Add("/smtpserverport", this.smtpPort);
  }
  if (this.smtpUseSsl == true) {
    mail.Fields.Add("/smtpusessl", this.smtpUseSsl);
  }
  if (this.smtpTimeout != "") {
    mail.Fields.Add("/smtpconnectiontimeout", this.smtpTimeout);
  }
  // Actually send this mail
  SmtpMail.SmtpServer = this.smtpServer;
  try {
    SmtpMail.Send(mail);
    this.errorMessage = "";
  } catch (Exception ex) {
    this.errorMessage = ex.Message;
  }
  return (this.errorMessage);
}