Trying to send the message to my Gmail account.

Question

I'm trying to send the message to my Gmail account through SMTP. And here is my code.

try
           {
               MailMessage msg = new MailMessage();
               msg.From = new MailAddress("[e-mail]");
               msg.To.Add("[e-mail]");
               msg.Subject = "test";
               msg.Body = "Test Content";
               msg.Priority = MailPriority.High;
               SmtpClient client = new SmtpClient();
               client.UseDefaultCredentials = false;
               client.Credentials = new NetworkCredential("[e-mail]", "123", "smtp.gmail.com");
               client.Host = "smtp.gmail.com";
               client.Port = 587;
               client.DeliveryMethod = SmtpDeliveryMethod.Network;
               client.EnableSsl = true;
               client.Send(msg);
           }
           catch (Exception ex)
           {
               throw ex;
           }

 

It's throwing the exception "The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Authentication Required"