void registerPlugin(Swift_Events_EventListener $plugin) Register a plug-in

SparkPostTransport class SparkPostTransport extends

void __construct(LoggerInterface $logger) Create a new log transport instance

void handle(Mailer $mailer)

start() {@inheritdoc}

TransportManager class TransportManager extends

send(Swift_Mime_Message $message, $failedRecipients = null) {@inheritdoc}

void setContainer(Container $container)

mixed later(int $delay, string|array $view, array $data = array(), Closure|string $callback = null

void __construct(Mailer $mailer)