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android.os.NetworkOnMainThreadException at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133) at java.net.InetAddress.lookupHostByName(InetAddress.java:385) at java.net.InetAddress.getLocalHost(InetAddress.java:365) at javax.mail.internet.InternetAddress.getLocalAddress(InternetAddress.java:517) at javax.mail.internet.UniqueValue.getUniqueMessageIDValue(UniqueValue.java:99) at javax.mail.internet.MimeMessage.updateMessageID(MimeMessage.java:2054) at javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:2076) at javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:2042) at javax.mail.Transport.send(Transport.java:117) at com.example.emailsendnoui.sending.send(sending.java:119) at com.example.emailsendnoui.MainActivitySecond.send_mail(MainActivitySecond.java:86) at com.example.emailsendnoui.MainActivitySecond.access$0(MainActivitySecond.java:73) at com.example.emailsendnoui.MainActivitySecond$1.onClick(MainActivitySecond.java:47) at android.view.View.performClick(View.java:4240) at android.view.View$PerformClick.run(View.java:17721) at android.os.Handler.handleCallback(Handler.java:730) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5103) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:525) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) at dalvik.system.NativeStart.main(Native Method)