Ftyjtk

I build an APP to send a short message through Java mail API with a guide from this . It works on my android 5.0.2 phone. But when I deploy it on android 6 or higher, it always failed on authentication.
There is no special change for mail setting compared with the guide mentioned above. I list some of them for information.

    public MailSender(String user, String password, String mailhost) {

    this.user = user;

    this.password = password;

    Log.i("SMTP_mail", mailhost);



    Properties props = new Properties();

    props.setProperty("mail.transport.protocol", "smtp");

    props.setProperty("mail.host", mailhost);

    props.put("mail.smtp.auth", "true");

    props.put("mail.smtp.port", "465");

    props.put("mail.smtp.socketFactory.port", "465");

    props.put("mail.password", password);

    props.put("mail.smtp.starttls.enable","true");

    props.put("mail.smtp.socketFactory.class",

            "javax.net.ssl.SSLSocketFactory");

    props.put("mail.smtp.socketFactory.fallback", "false");

    props.setProperty("mail.smtp.quitwait", "false");



    session = Session.getDefaultInstance(props, this);

    session.setDebug(true);

}

Also, I added permissions check at runtime with a new request from API 23.

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.INTERNET)

            != PackageManager.PERMISSION_GRANTED) {

        ActivityCompat.requestPermissions(this,

                new String{Manifest.permission.INTERNET},

                4);

    }

And AndroidManifest.xml is as following:

    <uses-permission android:name="android.permission.RECEIVE_SMS" />

<uses-permission android:name="android.permission.READ_SMS" />

<uses-permission android:name="android.permission.SEND_SMS" />

<uses-permission android:name="android.permission.READ_PHONE_STATE" />

<uses-permission android:name="android.permission.INTERNET" />

<uses-permission android:name="android.permission.CALL_PHONE" />

<uses-permission android:name="android.permission.BLUETOOTH" />

<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

<uses-permission android:name="android.permission.MANAGE_OWN_CALLS" />

<uses-permission android:name="android.permission.MODIFY_PHONE_STATE" />

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

With help from the guide for debugging JavaMail, I collect the logs for success and failure.
Success on Android 5:

And failure on Android 6:

The app code is the same for these two logs except the platforms are different.

Also I notice that there are some certificate failure seen on android 6 log, but from stackoverview search, it seems not a big deal. I am not sure whether it impact anything.

E/NativeCrypto: ssl=0x7ba1e98480 cert_verify_callback x509_store_ctx=0x7ba1cfbc98 arg=0x0
ssl=0x7ba1e98480 cert_verify_callback calling verifyCertificateChain authMethod=ECDHE_RSA

I/System.out: gba_cipher_suite:TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA

Could anyone help with this issue? It bothers me for several days. Your help is very appreciated.

Add the INTERNET permission to your manifest file.

You have to add this line:

<uses-permission android:name="android.permission.INTERNET" /> 

outside the application tag in your AndroidManifest.xml