Event email aggregation
Some events, such as notification of power recycling, host-to-switch network connectivity failures, and other events, can generate many email messages. To avoid filling your inbox with email, you can aggregate your event rule notifications by defining a system-wide aggregation time interval and a per-event-rule notification count.
If you set email aggregation and events-per-rule reach the threshold value for the event rule or the time interval expires, the system aggregates the events and sends a single email per event rule.