Hexamail Guard Administration Guide - Messaging - User Stats
This allows collection of email route information for all email. This will increase the RAM and disk usage and will be a little slower.
This allows collection of attachment count and size statistics. This involves processing the MIME of every email so can be a little slower.
This allows collection of time-based statistics for every email route detected. This will increase the RAM and disk usage of the statistics collected and will be a little slower.
For each route stats are collected for the quarterly, weekly and daily count, size, attachment count and attachment sizes. This can be up to 0.5GB for 200,000 routes.