public void SendMessage(IEnumerable <string> to, string subject, string body) { var message = SendGrid.GenerateInstance(); foreach (string recipient in to) { message.AddTo(recipient); } message.From = new MailAddress(From); message.Html = body; message.Subject = subject; var transportInstance = REST.GetInstance(new NetworkCredential(_settings.SendgridUsername, _settings.SendgridPassword)); transportInstance.Deliver(message); }