C# SmtpClient class not able to send email using gmail

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You won’t believe what fixed my problem.

The Credentials property

ss.Credentials = new NetworkCredential("username", "pass");

must be declared after

ss.UseDefaultCredentials = false;

So the final working code listing is

SmtpClient ss = new SmtpClient("smtp.gmail.com", 587);
ss.EnableSsl = true;
ss.Timeout = 10000;
ss.DeliveryMethod = SmtpDeliveryMethod.Network;
ss.UseDefaultCredentials = false;
ss.Credentials = new NetworkCredential("username", "pass");

MailMessage mm = new MailMessage("donotreply@example.com", "destination@example.com", "subject here", "my body");
mm.BodyEncoding = UTF8Encoding.UTF8;
mm.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
ss.Send(mm);

Is this a bug?

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