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Question by appmetrikOmi · May 25, 2017 at 01:19 PM · email

SmtpClient gmail An existing connection was forcibly closed by the remote host.

I am getting this error when I am trying to send and email

         mail.From = new MailAddress("myemail@gmail.com");
         mail.To.Add("sendto@gmail.com");
         mail.Subject = "Test Mail Subject";
         mail.Body = "This is for testing SMTP mail from GMAIL";
 
         SmtpClient smtpServer = new SmtpClient("smtp.gmail.com");
         smtpServer.Port = 587;
         smtpServer.Credentials = new System.Net.NetworkCredential("myemail@gmail.com", "mypassword") as ICredentialsByHost;
         smtpServer.EnableSsl = true;
         ServicePointManager.ServerCertificateValidationCallback = delegate(object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors){
             return true;
         };
         smtpServer.Send(mail);
         Debug.Log("success");

I tried different soltuions, disable anti virus firewall, enabling less secure login setting in gmail, but nothing seem to work, Any idea what might be causing this

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Answer by Shivarana · Jun 12, 2017 at 03:43 PM

Hi there,

Got exactly the same problem. I tried changing port to 465 which crashes Unity completely. Found other syntax for

 SmtpClient smtpServer = new SmtpClient ("smtp.gmail.com", 587);

But result is the same.

Does anyone else has an idea?

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Answer by judy3turn · Oct 04, 2017 at 01:21 AM

Having the same issue and it's associated with gmail's increases security. The last suggestion was to try 2 step security but when I tried that the web site put me in an infinite login loop. Sooooo....

Tried with my GoDaddy account and that doesn't work with ssl enabled and their ssl port.

Not a happy camper at the moment

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