android sending email from app no longer working

Question

I used this tutorial to send emails from inside my app. I used the same code to 3 different apps and it all worked well. But now, a few months later, it stopped working. I have searched all the possible sites, but none of them helped me. I tried setting a lower security from my Gmail account and also changing the properties for my session, but nothing worked. I would really appreciate some help.

            Log.d("EmailSender","sending message");
            Properties props = new Properties();
            props.put("mail.smtp.host", host);
            props.put("mail.smtp.socketFactory.port", "465");
            props.put("mail.smtp.socketFactory.class",
                    "javax.net.ssl.SSLSocketFactory");
            props.put("mail.smtp.auth", "true");
            props.put("mail.smtp.port", "465");
            Session session = Session.getDefaultInstance(props, new javax.mail.Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(user,pass);
                }
            });
            try {
                Message message = new MimeMessage(session);
                message.setFrom(new InternetAddress(user));
                message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(SharedPreferenceUtils.getUserEmail(getActivity())));
                message.setSubject(subject);
                message.setContent(content, "text/html; charset=utf-8");

                //Transport.send(message);
                Transport transport = session.getTransport("smtps");
                transport.connect (host, Integer.parseInt(port), user, pass);
                transport.sendMessage(message, message.getAllRecipients());
                transport.close();
                Log.d("EmailSender", "message sent");
            } catch (MessagingException e) {
                e.printStackTrace();
                throw new RuntimeException(e);
            }

My error:

java.net.ConnectException: failed to connect to smtp.gmail.com/2a00:1450:4013:c01::6d (port 465) after 90000ms: isConnected failed: ENETUNREACH (Network is unreachable)
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1391)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:412)
    at javax.mail.Service.connect(Service.java:288)
    at com.mihaela.myapp.ui.dialog.EnterPasswordDialog$SendMailTask.doInBackground(EnterPasswordDialog.java:222)
    at com.mihaela.myapp.ui.dialog.EnterPasswordDialog$SendMailTask.doInBackground(EnterPasswordDialog.java:179)
    at android.os.AsyncTask$2.call(AsyncTask.java:288)
    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
    at java.lang.Thread.run(Thread.java:818)
     Caused by: java.net.ConnectException: failed to connect to smtp.gmail.com/2a00:1450:4013:c01::6d (port 465) after 90000ms: isConnected failed: ENETUNREACH (Network is unreachable)
    at libcore.io.IoBridge.isConnected(IoBridge.java:267)
    at libcore.io.IoBridge.connectErrno(IoBridge.java:191)
    at libcore.io.IoBridge.connect(IoBridge.java:127)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:461)
    at java.net.Socket.connect(Socket.java:918)
    at java.net.Socket.connect(Socket.java:844)
    at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:233)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:189)
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1359)
        ... 10 more
     Caused by: android.system.ErrnoException: isConnected failed: ENETUNREACH (Network is unreachable)
    at libcore.io.IoBridge.isConnected(IoBridge.java:252)
        ... 19 more

It shows that network is unreachable. Are you sure you connected to the internet? Do you have the internet permission enabled in your manifest? — Akeshwar Jha, Jun 29 '16 at 12:05
yes, I have connected it to the internet. The permission was there from the start. I also tried to ping that website using adb, and that also worked. — mihaela timpu, Jun 29 '16 at 13:24
I tried to do that from a different network and it worked.Thank you for your help! Can you add this as a response so I can mark it as solved? — mihaela timpu, Jun 30 '16 at 09:26

score 0 · Accepted Answer · edited May 23 '17 at 12:08

From the logs:

java.net.ConnectException: failed to connect to smtp.gmail.com/2a00:1450:4013:c01::6d (port 465) after 90000ms: isConnected failed: ENETUNREACH (Network is unreachable)

Network is unreachable. The code looks okay, therefore the issue must be with the network. Please check your connectivity. Possible causes could be:

Very slow/ bad network. Try changing the network.
Internet permission not available in the manifest (this shouldn't be the case as described by your problem). Add the permission.

For future, you can add a network-check before sending network requests. This thread has some good answers for checking the network connectivity: How to check internet access on Android? InetAddress never times out

android sending email from app no longer working

1 Answers1