如何在laravel 5中有条件地更改邮件传输器？

'mailers' => [
    'smtp' => [
        'transport' => 'smtp',
        'host' => 'smtp.example.com',
        'port' => 587,
        'encryption' => 'tls',
        'username' => 'your-email@example.com',
        'password' => 'your-email-password',
        'timeout' => null,
    ],
    'custom' => [
        'transport' => 'smtp',
        'host' => 'smtp.custom.com',
        'port' => 587,
        'encryption' => 'tls',
        'username' => 'your-custom-email@example.com',
        'password' => 'your-custom-email-password',
        'timeout' => null,
    ],
],

use Illuminate\Support\Facades\Mail;

if ($condition) {
    Mail::mailer('custom')->to($email)->send($message);
} else {
    Mail::to($email)->send($message);
}