This policy will not call out to the Email Service, but will instead use any existing cached result of previous API calls used with the
RemoteOnly policy. This policy comes with a caveat; queried results are cached 'as called'. This means that a cached query will only match a direct query result to the service (using
RemoteOnly). For instance, if a call is made to get all results using
RemoteOnly, and then a filter call is applied using
CacheOnly, all the same results from the previous call are returned.