Command line mta monitoring is best achieved with either the "monitor mta" command or remotely via SNMP. from the CLI type "help monitor" and page down to the mta section for more info on the counters available.
Regarding your content filtering policy: If you turn up the logging level for the Brightmail Engine to "info" or "debug", and then the command line tools to "tail -f" the bmserver log file, you should get a detailed picture of the evaulation thatas occuring with regards that policy.