MTA logs show the following error
(err) ipfreq_cleanup: [-] [Brightmail] (ERROR:29482.2926384960): [10058] Error getting file status /data/scanner/rules/ipfreq.db.
The SMG Scanner is attempting to perform regular maintentance on the database which manages local IP connection reputation for the Connection Classification and is unable to lock the IP reputation database.
This error does not affect message scanner or delivery and only indicates a temporary condition when performing regular maintenance.
If you are concerned by the error or it occures frequently, the local IP reputation database can be manually reset using the following procedure. This will, however, erase all local IP reputation history and SMG will begin building IP reputation from an empty database.
delete ipfreqrules
This will need to be performed on all SMG scanners which are generating the error.