When I launch email client from my application, a compose window of email client gets opened but when I launch like this, I am unable to see inbox, sent items etc...
Just in case anyone else gets here with the same question, there is a solution.
Intent intent = new Intent("android.intent.action.MAIN");
intent.setComponent(ComponentName.unflattenFromString("com.google.android.email/com.android.email.activity.Welcome"));
intent.addCategory("android.intent.category.LAUNCHER");
startActivity(intent);
You can get the component name from LogCat. The only problem is, I think, if the user uses another application for email.