string nomeRemetente = "Contato N-Multifibra";
        string emailRemetente = "webmaster@nmultifibra.com.br";
        string assuntoMensagem = assunto;
        MailMessage objEmail = new MailMessage();
        objEmail.From = new System.Net.Mail.MailAddress(nomeRemetente + "<" + emailRemetente + ">");
        foreach (var dest in destinatarios)
        {
            objEmail.To.Add(new MailAddress(dest));
        }
        objEmail.Bcc.Add(new MailAddress("gbarreto@crivos.com.br"));
        objEmail.Bcc.Add(new MailAddress("tlyria@crivos.com.br"));
        objEmail.Priority = System.Net.Mail.MailPriority.Normal;
        objEmail.IsBodyHtml = true;
        objEmail.Subject = assuntoMensagem;
        objEmail.Body = conteudoMensagem;
        objEmail.From = new MailAddress(emailRemetente);
        objEmail.SubjectEncoding = System.Text.Encoding.GetEncoding("UTF-8");
        objEmail.BodyEncoding = System.Text.Encoding.GetEncoding("UTF-8");
        System.Net.Mail.SmtpClient objSmtp = new System.Net.Mail.SmtpClient();
        objSmtp.Host = "smtp.nmultifibra.com.br";
        objSmtp.EnableSsl = true;
        objSmtp.UseDefaultCredentials = false;
        objSmtp.DeliveryMethod = SmtpDeliveryMethod.Network;
        objSmtp.Credentials = new System.Net.NetworkCredential(objEmail.From.ToString(), "Mudar19@@123");
        objSmtp.Port = 587;

        try
        {
            objSmtp.Send(objEmail);
        }
        catch (Exception ex)
        {

        }
        finally
        {
            objEmail.Dispose();
        }