public function contact_email(Request $request)
{
    $data['name'] = $request->name;
    $data['email'] = $request->email;
    $data['mobile'] = $request->mobile;
    $data['message'] = $request->message;

    Mail::send('email-view', ['data' => $data], function ($message) {
    $message->to(env('MAIL_USERNAME'))->subject('Contact Us Email Notification!!');
    });
    return redirect()->back();
}

Mail::send('frontend.englishlistening.contact_reply', $data, function($message) use ($toEmail, $toName, $fromEmail, $fromName, $subject){

          $message->from($fromEmail, $fromName);
          $message->to($toEmail, $toName);
          $message->subject($subject);
        });

dd(env('MAIL_USERNAME'))

Mail::send('email-view', $data, function ($message) {
     $message->from('thesystem@mail.com', 'the name of your app');
     $message->to('correct@email.com', 'This is a correct format')->subject('Example');
 });

$data = $request->only('name', 'email', 'mobile', 'message') + ['to' => env('MAIL_USERNAME')];

public function contact_email(Request $request)
{
    $data = $request->only('name', 'email', 'mobile', 'message');

    Mail::send('email-view', $data, function ($message) use ($data) {
        $message->from('thesystem@mail.com', 'the name of your app');
        $message->to($data['email'], $data['name'])->subject('This is a way');
    });
 }

$data = $request->only('name', 'email', 'mobile', 'message');