How Incoming Mail Messages are Counted

Counts of incoming messages are dependent on the number of recipients per message. For example, an incoming message from example.com sent to three recipients is counted as three messages coming from that sender.

Because the messages blocked by sender reputation filtering do not actually enter the work queue, the appliance does not have access to the list of recipients for an incoming message. In this case, a multiplier is used to estimate the number of recipients. This multiplier is based on research of a large sampling of existing customer data.