By default, Symantec Messaging Gateway tracks data for several basic reports. Before you can generate other reports, you must tell Symantec Messaging Gateway to track and store data appropriate for the report. Extended statistics such as Top Senders, Top Sender Domains, and Invalid Recipient data are only collected when the appropriate options are selected.
Because the data storage requirements for some reports can be high, choose an appropriate length of time to store report data. In particular, the sender statistics usually consume a large amount of disk space.