SmtpException while sending Email

Question

I am trying to send Email through my C# code but I am getting SmtpException

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 173.194.67.109:587

Here is how I am sending Email:

string HostAddress = "smtp.gmail.com"; MailMessage msg = new MailMessage(); msg.From = new MailAddress(fromEmail); msg.Subject = "Test Email"; msg.Body = "Hi testing invoice"; msg.IsBodyHtml = true; msg.To.Add(new MailAddress("[email protected]")); SmtpClient client = new SmtpClient(); client.Host = HostAddress; client.EnableSsl = true; NetworkCredential creadit = new NetworkCredential(); creadit.UserName = msg.From.Address; creadit.Password = Password; client.UseDefaultCredentials = true; client.Credentials = creadit; client.Port = 587; client.Send(msg);

Did you have a look at SmtpException.InnerException as it could contain more detailed information. — Philipp Grathwohl
– Philipp Grathwohl, Commented Jun 26, 2015 at 8:01
Do you test this code behind a proxy? If so did you configure your program to use it? Maybe a firewall is blocking your request? — Philipp Grathwohl
– Philipp Grathwohl, Commented Jun 26, 2015 at 8:31
possible duplicate of c# SmtpClient class not able to send email using gmail — Ignacio Soler Garcia
– Ignacio Soler Garcia, Commented Jun 26, 2015 at 8:32
@IgnacioSolerGarcia even the solution recommended in that post doesn't work — Nuke
– Nuke, Commented Jun 26, 2015 at 8:37

Bradley Smith · Accepted Answer · 2015-06-26 08:11:33Z

Your problem is here:

client.UseDefaultCredentials = true; client.Credentials = creadit;

You are specifying a set of credentials but you are also telling SmtpClient to use the default credentials (i.e. the Windows username and password of the logged-in user). Set UseDefaultCredentials to false and it will use your supplied credentials instead.

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