--- Name: mailer --- SilverStripe\Core\Injector\Injector: Symfony\Component\Mailer\MailerInterface: class: Symfony\Component\Mailer\Mailer constructor: transport: '%$Symfony\Component\Mailer\Transport\TransportInterface' Symfony\Component\EventDispatcher\EventDispatcherInterface.mailer: class: Symfony\Component\EventDispatcher\EventDispatcher calls: - [addSubscriber, ['%$SilverStripe\Control\Email\MailerSubscriber']] Symfony\Component\Mailer\Transport\TransportInterface: factory: Symfony\Component\Mailer\Transport factory_method: fromDsn constructor: dsn: 'sendmail://default' dispatcher: '%$Symfony\Component\EventDispatcher\EventDispatcherInterface.mailer' --- Name: mailer-dsn-env After: '*' Only: envvarset: MAILER_DSN --- SilverStripe\Core\Injector\Injector: Symfony\Component\Mailer\Transport\TransportInterface: constructor: dsn: '`MAILER_DSN`'