Swift_Mailer Swift_Transport_SendmailTransport Swift_Transport_MailTransport Swift_Transport_FailoverTransport Swift_Plugins_RedirectingPlugin Swift_Plugins_BlackholePlugin Swift_Plugins_ImpersonatePlugin Symfony\Bundle\SwiftmailerBundle\Logger\MessageLogger Symfony\Bundle\SwiftmailerBundle\DataCollector\MessageDataCollector %swiftmailer.single_address% %swiftmailer.sender_address% %swiftmailer.spool.enabled%