If the Zimbra-Logger package is installed on a Zimbra mailbox server, Server Statistic shows bar graphs of the Message Count, Message Volume, Anti-Spam, and Anti-Virus activity. The information is displayed for the last 48 hours, and 30, 60, and 365 days.
In the navigation pane, selecting Server Statistics shows consolidated statistics for all mailbox servers. In the expanded view, selecting a specific server shows statistics for that server only along with disk usage.
You can see statistics by:
Message Count displays the number of messages sent and received. The last 48 hours shows the count per hour. The Last x days shows the count per day.
Message Volume displays the aggregate size in bytes of messages sent and receive per hour and per day. Graphs show the total inbound data by volume in KB, MB, or GB. The scale changes depending on the volumes in questions.
Anti-Spam/Anti-Virus Activity displays the number of messages that were checked for spam or viruses and the number of messages that were tagged as spam or deemed to contain a virus.
Disk for a selected server displays the disk space used and the disk space available. The information is displayed for the last hour, day, month and year.
Mailbox Quota displays information about each account sorted by mailbox size in descending order. See Viewing Mailbox Quotas.
The Message Count and the Anti-spam/Anti-virus Activity graphs display a different message count because:
Outbound messages may not go through the Amavisd filter, as the system architecture might not require outbound messages to be checked.
Message are received and checked by Amavisd for spam and viruses before being delivered to all recipients in the message. The message count shows the number of recipients who received messages.