private void button6_Click(object sender, EventArgs e)
        {
            Mail mail = new Mail();

            mail.To      = "*****@*****.**";
            mail.From    = "*****@*****.**";
            mail.Subject = "teste";
            mail.Body    = "teste de envio de email sobre a SSL";

            //KhronusReturn ret = MailUtilities.send("email-ssl.com.br", "*****@*****.**", "k070213r", 587, true, mail); //funciona
            KhronusReturn ret = MailUtilities.send("email-ssl.com.br", "*****@*****.**", "k070213r", 587, false, mail);

            MessageBox.Show(ret.Message);
        }
        private void button7_Click(object sender, EventArgs e)
        {
            Mail mail = new Mail();

            mail.From = txtDe.Text;
            mail.To   = txtPara.Text;
            //mail.Bcc = "*****@*****.**";
            mail.Subject = txtAssunto.Text;
            mail.Body    = txtCorpo.Text;

            //mail.AttachmentList.Add(@"D:\desenvolvimento_old\analise de sistemas\nfe\documentacao\NT_2016_002_v1.51.pdf");

            //KhronusReturn ret = MailUtilities.send("smtp.gmail.com", "*****@*****.**", "fev@030277@", 587, true, mail);
            KhronusReturn ret = MailUtilities.send(txtSmtp.Text, txtUsuario.Text, txtSenha.Text, NumberUtilities.parseInt(txtPorta.Text), chkSsl.Checked, mail);

            MessageBox.Show(ret.Status + " " + ret.Message);
        }