Unknown Host Exception when attempting to send a mail from Android, but not editor

This is the method in which i send mail

 public static void sendMail(string title, string data){
 
     MailMessage mail = new MailMessage();
     
     mail.From = senderMail;
     mail.To.Add (receiverMail);
     mail.Subject = title;
     mail.Body =  data;
     
     
     SmtpClient client = new SmtpClient("smtp.gmail.com");
     client.Port =  587;
     client.Credentials = new System.Net.NetworkCredential(sender, password) as ICredentialsByHost;
     client.EnableSsl = true;
         ServicePointManager.ServerCertificateValidationCallback = 
             delegate(object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) 
                 { return true; };
      client.Send(mail);
      Debug.Log("success");
 
 }

In the editor I don't get this error at all, but in Android I get this error :

I/Unity ( 3719): SocketException: No such host is known

I/Unity ( 3719): at System.Net.Dns.GetHostByName (System.String hostName) [0x00000] in :0

I/Unity ( 3719): at System.Net.Dns.GetHostEntry (System.String hostNameOrAddress) [0x00000] in :0

I/Unity ( 3719): at System.Net.Dns.GetHostAddresses (System.String hostNameOrAddress) [0x00000] in :0

I/Unity ( 3719): at Mailer.sendMail (System.String title, System.String data) [0x00000] in :0

I/Unity ( 3719): at Mailer.Start () [0x00000] in :0

If you can help me out that would be great. Thanks in Advance

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