Type Error thrown when used with Mailhog in Lando

Thanks for the report.

I've corrected the instructions https://www.drupal.org/docs/contributed-modules/drupal-symfony-mailer/ge... → please can you try again?

That did it. Test email now goes out as expected. Thanks.

Great thanks for reporting back

I add these lines to my settings.local and now the mailhog is running well.

# Symfony Mailer module sendmail commands.
$settings['mailer_sendmail_commands'] = [
  ini_get('sendmail_path') . ' -t'
];

# Set the default transport to mailhog
$config['symfony_mailer.settings']['default_transport'] = 'mailhog';

Automatically closed - issue fixed for 2 weeks with no activity.

I had to also set the default command to use for lando.

$config['symfony_mailer.mailer_transport.sendmail']['configuration']['query']['command'] = ini_get('sendmail_path') . ' -t';