[Mono-list] ERROR 535 5.7.8 Error - Occurs on linux but now windows

[drLeif]

ERROR 535 5.7.8 Error: Authentication failed: UGFzc3dvcmQ6
I'm getting the above error on Ubuntu but not on windows 8.1 with the
following code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Net.Mail;
using System.Net;
using System.Security.Cryptography.X509Certificates;
using System.Net.Security;

using S22.Imap;
using S22;


namespace testing_email
{
    class Program
    {
        static void Main(string[] args)
        {
            SmtpClient client = new SmtpClient("mail.XXXXXX.com");

            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            client.UseDefaultCredentials = false;
            client.Credentials = new
System.Net.NetworkCredential("myreportuser at XXXXX.com", "password");
            client.Port = 25;
            client.EnableSsl = true;
            

            MailMessage mailit = new MailMessage();
            mailit.Body = "Body body body";
            mailit.Subject = "Testing Subject";
            mailit.IsBodyHtml = true;
            mailit.From = new MailAddress("myreportuser at XXXXXX.com");
            mailit.To.Add("l.send.it at XXXXX.com");

            try
            {
                ServicePointManager.ServerCertificateValidationCallback =
delegate(object s, X509Certificate certificate, X509Chain chain,
SslPolicyErrors sslPolicyErrors) { return true; };
                
                client.Send(mailit);
                Console.WriteLine("Message sent");
                Console.ReadLine();
            }
            catch (Exception ex)
            {
                Console.WriteLine("ERROR " + ex.Message);
                Console.ReadLine();
            }            
        }
    }
}
----------------------------
Once again this code runs fine out of VS2013 but can't get it to run on
monodevelop under ubuntu.  

Thanks for the help in advance.




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