Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

The Received Connections graph shows the incoming connections from mail clients that attempt to 
authentication their connections using SMTP authentication over the time range you specify. The graph 
displays the total number of connections the appliance received, the number that did not attempt to 
authenticate using SMTP authentication, the number that failed and succeeded to authenticate the 
connection using a client certificate, and the number that failed and succeeded to authenticate using the 
SMTP AUTH command. 

The Received Recipients graph displays the number of recipients whose mail clients attempted to 
authenticate their connections to the Email Security appliances to send messages using SMTP 
authentication. The graph also show the number of recipients whose connections were authenticated and 
the number of recipients whose connections were not authenticated.

The SMTP Authentication details table displays details for the domains whose users attempt to 
authenticate their connections to the Email Security appliance to send messages. For each domain, you 
can view the number of connection attempts using a client certificate that were successful or failed, the 
number of connection attempts using the SMTP AUTH command that were successful or failed, and the 
number that fell back to the SMTP AUTH after their client certificate connection attempt failed. You can 
use the links at the top of the page to display this information by domain name or domain IP address.

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. 

The Top Offenders by Incident chart shows the envelope senders who most frequently attempted to send 
messages to more recipients than the configured limit. Each attempt is one incident. This chart 
aggregates incident counts from all listeners. 

The Top Offenders by Rejected Recipients chart shows the envelope senders who sent messages to the 
largest number of recipients above the configured limit. This chart aggregates recipient counts from all 
listeners. 

To configure rate limiting by envelope sender or modify the existing rate limit, see 

The System Capacity page provides a detailed representation of the system load, including messages in 
the work queue, average time spent in the work queue, incoming and outgoing messages (volume, size, 
and number), overall CPU usage, CPU usage by function, and memory page swapping information.