how to check whether email client installed on device

Use this, works for me :

public static boolean isMailClientPresent(Context context){
    Intent intent = new Intent(Intent.ACTION_SEND);
    intent.setType("text/html");
    final PackageManager packageManager = context.getPackageManager();
    List<ResolveInfo> list = packageManager.queryIntentActivities(intent, 0);

    if(list.size() == 0)
        return false;
    else 
        return true;
}

For email client, specifically, you should use:

intent.setType("message/rfc822");

instead of:

intent.setType("text/html");