InvoiceNinja – Mailer problem

I maintain an InvoiceNinja instance and an error was reported when sending mail.

Check the logs in storage/logs/laravel.log I see there is an error:

Mailer Problem: scheme is not supported; supported schemes for mailer "smtp" are: "smtp", "smtps"

First, I checked my .env and saw MAIL_MAILER=smtps, so I dug into config/mail.php to have a look.

There was no scheme in the mailers.smtp, so I added 'scheme' => 'smtps', to it:

    'mailers' => [
        'smtp' => [
            'scheme' => 'smtps',
            'transport' => 'smtps',

I cleared the config cache using php artisan clear:config.

Now invoices are sending.