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When storing message in file it will be serialized with class name like Swift_Message_000000003b027a18000000005cb90b1f. After container rebuild this name will change. So if cache was cleared after message stored but before swiftmailer:spool:send command executed there will be error Catchable Fatal Error: Argument 1 passed to Swift_Transport_MailTransport::send() must implement interface Swift_Mime_Message, instance of __PHP_Incomplete_Class given.