Sending email from within Unity using smtp service

Hi am trying to send an email from inside unity on smartphones using the SmtpClient class. I have achieved this quite simple task on iOS but the exact same code does not work on android. Here's the code:

 private IEnumerator sendAutoMail (string textBody,string title)
         {
                 MailMessage mail = new MailMessage();
 
                 mail.From = new MailAddress(sender);
                 mail.To.Add(receiver);
                 mail.Subject = "R4UL " + title;
                 mail.Body = textBody;
 
                 Debug.Log("Connecting to SMTP server");
                 SmtpClient smtpServer = new SmtpClient("smtp.gmail.com");
                 smtpServer.Port = 587;
                 smtpServer.Credentials = new System.Net.NetworkCredential(sender, password) as ICredentialsByHost;
 
                 smtpServer.EnableSsl = true;
                 ServicePointManager.ServerCertificateValidationCallback = 
                         delegate(object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) 
                 { return true; };
                 Debug.Log("Sending message");
 
                 smtpServer.Send(mail);
 
 
                 yield return null;
         }

where sender, password and receiver are my gmail account, my gmail password and the person I wish to email respectively.

So this works perfectly on iOS but on android throws the following error:

I/Unity ( 6256): SocketException: No such host is known

I/Unity ( 6256): at System.Net.Dns.GetHostByName (System.String hostName) [0 x00000] in :0 I/Unity ( 6256): at System.Net.Dns.GetHostEntry (System.String hostNameOrAdd ress) [0x00000] in :0 I/Unity ( 6256): at System.Net.Dns.GetHostAddresses (System.String hostNameO rAddress) [0x00000] in :0 I/Unity ( 6256): at System.Net.Sockets.TcpClient.Connect (System.String host name, Int32 port) [0x00000] in :0 I/Unity ( 6256): at System.Net.Sockets.TcpClient..ctor (System.String hostna me, Int32 port) [0x00000] in :0 I/Unity ( 6256): at System.Net.Mail.SmtpClient.SendInternal (System.Net.Mail .MailMessage message) [0x00000] in :0 I/Unity ( 6256): at System.Net.Mail.SmtpClient.Send (System.Net.Mail.MailMes sage message) [0x00000] in :0 I/Unity ( 6256): Rethrow as SmtpException: Message could not be sent. I/Unity ( 6256): at System.Net.Mail.SmtpClient.Send (System.Net.Mail.MailMes sage message) [0x00000] in :0 I/Unity ( 6256): at FeedbackSender+c__Iterator1.MoveNext () I have managed to pintpoint the error location at the line: smtpServer.Send(mail); Any ideas as to what might be causing this issue? I have both android and iOS pro versions. Cheers