laravelstart/laravelstart

use App\Mail\WelcomeMail;
use App\Models\User;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Queue\Queueable;
use Illuminate\Support\Facades\Mail;

class SendWelcomeEmail implements ShouldQueue
{
    use Queueable;

    public function __construct(private readonly User $user)
    {
    }

    public function handle(): void
    {
        Mail::to($this->user)->send(new WelcomeMail($this->user));
    }
}

use App\Jobs\SendWelcomeEmail;
use App\Models\User;

class UserObserver
{
    public function created(User $user): void
    {
        SendWelcomeEmail::dispatchAfterResponse($user);
    }
}

use App\Models\Observers\UserObserver;
use Illuminate\Database\Eloquent\Attributes\ObservedBy;

#[ObservedBy(UserObserver::class)]
class User extends Authenticatable implements FilamentUser
{
    // ...
}