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();
}