Can't catch message using the Log driver

Hello, I'm trying to test this package using the Log driver.

I setup my Mail driver to use Log driver (and have correctly emails send by my app going to the log).

But can't catch any email...

.env:
```
MAILBOX_DRIVER=log
MAIL_MAILER=log
```

My boot in AppServiceProvider:

```
public function boot()
{
Mailbox::catchAll(CatchAllMailbox::class);
}
```

And catchAllMailbox:
```