Intent email = new Intent(Intent.ACTION_SEND);

    email.putExtra(Intent.EXTRA_EMAIL , new String[] {"myemail"});
    email.putExtra(Intent.EXTRA_SUBJECT,"Hello");
    email.putExtra(Intent.EXTRA_TEXT , my);
    email.setType("mesage/rfc822");
    startActivity(Intent.createChooser(email,"myemail"));