setBaseUrl('../../../src/DebugBar/Resources'); use DebugBar\Bridge\SwiftMailer\LogCollector; use DebugBar\Bridge\SwiftMailer\MessagesCollector; $mailer = Swift_Mailer::newInstance(Swift_NullTransport::newInstance()); $debugbar['messages']->aggregate(new LogCollector($mailer)); $debugbar->addCollector(new MessagesCollector($mailer)); $message = Swift_Message::newInstance('Wonderful Subject') ->setFrom(array('john@doe.com' => 'John Doe')) ->setTo(array('receiver@domain.org', 'other@domain.org' => 'A name')) ->setBody('Here is the message itself'); $mailer->send($message); render_demo_page();