Laravel class not found for mail - laravel

Question

I'm trying to generate a notification email to the webmaster when there's a new registration on the site I'm building.
I have a mail class called SignedUp at App\Mail\SignedUp.php.
In the Illuminate/Foundation/Auth/RegistersUser file, I have the following:
namespace Illuminate\Foundation\Auth;
use App\Organization;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Auth\Events\Registered;
use App\Mail\SignedUp;
trait RegistersUsers
{
use RedirectsUsers;
/**
* Show the application registration form.
*
* #return \Illuminate\Http\Response
*/
public function showRegistrationForm()
{
$organizations = Organization::all();
return view('auth.register', compact('organizations'));
}
/**
* Handle a registration request for the application.
*
* #param \Illuminate\Http\Request $request
* #return \Illuminate\Http\Response
*/
public function register(Request $request)
{
$this->validator($request->all())->validate();
event(new Registered($user = $this->create($request->all())));
$this->guard()->login($user);
Mail::to('example#example.com')->send(new SignedUp($user));
return $this->registered($request, $user)
?: redirect($this->redirectPath());
}
When I register a new user, I get this message:
Class 'Illuminate\Foundation\Auth\Mail' not found
if I change use App\Mail\SignedUp; to use App\Mail;, the error is still: Class 'Illuminate\Foundation\Auth\Mail' not found
use Mail; gives me Illuminate\Foundation\Auth\SignedUp' not found
use App\Mail\SignedUp; gives me Class 'Illuminate\Foundation\Auth\Mail' not found
Not attempting to import the class at all, and instead changing my statement to: \Mail::to('example#example.com')->send(new SignedUp($user));, I get Class 'Illuminate\Foundation\Auth\SignedUp' not found
A cannot figure out how to get it to find my mail class.
I'm just guessing and shooting in the dark - can anyone see what I'm doing wrong?
Here is my mail class file:
<?php
namespace App\Mail;
use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Contracts\Queue\ShouldQueue;
class SignedUp extends Mailable
{
use Queueable, SerializesModels;
public $url = 'https://av-cuauhtemoc.org/users';
public $user;
/**
* Create a new message instance.
*
* #return void
*/
public function __construct()
{
//
}
/**
* Build the message.
*
* #return $this
*/
public function build()
{
return $this->from('example#example.com')->view('emails.new-registration');
}
}

Answer 1

I finally stumbled upon the answer.
I also needed to import the use Illuminate\Support\Facades\Mail; class.
So this works:
use App\Mail\Signedup;
use Illuminate\Support\Facades\Mail;

Answer 2

first of all you shouldn't change Illuminate/Foundation/Auth/RegistersUser file, instead you have to overwrite this method in your RegisterController:
use App\Mail\SignedUp;
use Illuminate\Auth\Events\Registered;
use Illuminate\Http\Request;
use Mail;
public function register(Request $request)
{
$this->validator($request->all())->validate();
event(new Registered($user = $this->create($request->all())));
$this->guard()->login($user);
Mail::to('example#example.com')->send(new SignedUp($user));
return $this->registered($request, $user)
?: redirect($this->redirectPath());
}