Policy-Aware Message Sending
Given access to the Message object, a conduit can, in its send method, proceed the same way
as an interceptor in handleMessage.
It can defer the updating of the assertion status in the AssertionInfo objects until called upon by the PolicyVerificationOutInterceptor, i.e. implement the status update in the assertMessage method. If the status update takes place inside of the send method itself, assertMessage, at least for outbound messages, can be implemented as a no-op.