Viewing HA cluster mail statistics
Go to the various tabs under Centralized Monitor > Mail Statistics to view summaries for:
- the number of email messages,
- the size of email messages,
- the scan speed of email messages, and
- the transfer speed of email messages
All tabs may be viewed on a minute, hourly, daily, monthly, and yearly basis that the FortiMail HA cluster member(s) detected viruses, spam, or neither.
By default, all charts display statistics for All cluster members, however each chart may be filtered to show activity for specific cluster members by selecting the appropriate member under the following icon: 
In addition to viewing overall trends via the graph, you can also view details at each point in time. To view these details, hover your mouse over a bar in the graph. A tool tip appears next to that point on the graph, including the name of the antispam category, message count, and percentage relative to the overall mail volume at that time.
To use the Mail Statistics tab, first configure your FortiMail unit to detect spam and/or viruses. For more information, see Configuring profiles and Configuring policies.