你知道Laravel是怎么发出一封电子邮件的吗？

'smtp' => [
    'transport' => 'smtp',
    'host' => env('MAIL_HOST', 'smtp.mailgun.org'),
    'port' => env('MAIL_PORT', 587),
    'encryption' => env('MAIL_ENCRYPTION', 'tls'),
    'username' => env('MAIL_USERNAME'),
    'password' => env('MAIL_PASSWORD'),
    'timeout' => null,
    'auth_mode' => null,],

'mailgun' => [
    'domain' => env('MAILGUN_DOMAIN'),
    'secret' => env('MAILGUN_SECRET'),
    'endpoint' => env('MAILGUN_ENDPOINT', 'api.mailgun.net'),],

php artisan make:mail ContactEmail

namespace App\Mail;

use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Contracts\Queue\ShouldQueue;

class ContactEmail extends Mailable
{
    use Queueable, SerializesModels;
    public function __construct()
    {
        //
    }
    public function build()
    {
        return $this->view('view.name');
    }
}

public $contact;
public function __construct($contact){
    $this->contact = $contact;}

public function build(){
    return $this->to(config('mail.from.address'))->subject('HackerPair Inquiry')->view('emails.contact');}

Hi,
A Laravel user has sent you a message.
Name: {{ $contact['name'] }}
E-mail: {{ $contact['email'] }}
Message: {{ $contact['msg'] }}

Mail::to(config('mail.support.address'))->send(new ContactEmail($contact));