'Why mail facade method "mailer" not working?

I'm trying to set up sending mail from different mail drivers. For this I use the mailer method https://laravel.com/docs/8.x/mail#sending-mail-via-a-specific-mailer.

Here is my code

Mail::mailer('mailgun')
    ->to($user)
    ->later(now()->addSeconds(10), new NewProductMail($product));

When submitting, Laravel still uses the default driver, not the one I specified. How to solve this problem?

laravel-8

Sources

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