laravel mail success or failure
/**
 *  Send Mail from Parts Specification Form
 */
public function sendMail(Request $request) {
    $data = $request->all();
    $messageBody = $this->getMessageBody($data);
    Mail::raw($messageBody, function ($message) {
        $message->from('[email protected]', 'Learning Laravel');
        $message->to('[email protected]');
        $message->subject('Learning Laravel test email');
    });
    // check for failures
    if (Mail::failures()) {
        // return response showing failed emails
    }
    // otherwise everything is okay ...
    return redirect()->back();
}
