The post office maintains a set of queues bound to an address, the post office also
maintains a set of "allowable destinations" (see the code).
If postoffice.checkallowable = true then the post office will only allow messsages to be
routed to allowable destinations.
In other words it's a way of restricting the set of addresses to which you are allowed
to route.
This is useful for JMS, since JMS prohibits routing to addresses (JMS queues or topics)
which "do not exist".
Without such an address we wouldn't have any way of determining if such an address
exists.
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