Cisco Cisco Email Security Appliance C160 Mode D'Emploi

Rate Limiting by envelope sender allows you to limit the number of email message recipients per time 
interval from an individual sender, based on the mail-from address. The Rate Limits report shows you 
the senders who most egregiously exceed this limit. 

Use this report to help you identify the following: 

Compromised user accounts that might be used to send spam in bulk. 

Out-of-control applications in your organization that use email for notifications, alerts, automated 
statements, etc. 

Sources of heavy email activity in your organization, for internal billing or resource-management 
purposes. 

Sources of large-volume inbound email traffic that might not otherwise be considered spam. 

Note that other reports that include statistics for internal senders (such as Internal Users or Outgoing 
Senders) measure only the number of messages sent; they do not identify senders of a few messages to 
a large number of recipients.