Mailbox inboundMailbox = createInboundMailbox(sender.getActor(),
outboundBroker);
inboundBroker.setMailbox(inboundMailbox);
MessageStream outboundStream
= new OutboundMessageStream(_linkFactory, inboundBroker);
Mailbox outboundMailbox = createOutboundMailbox(outboundStream,
inboundBroker);
outboundBroker.setMailbox(outboundMailbox);