Cisco Cisco Email Security Appliance C390 사용자 가이드

client initiating a connection from the Internet. The log records all bytes 
transmitted between the two systems and classifies them as “Sent to” the 
connecting host or “Received from” the connecting host.

For more information, see 

. 

If you suspect problems with delivering email from the appliance, try the 
following strategies:

Determine if the problem is domain-specific.

Use the 

tophosts

 command to get immediate information about the email 

queue and determine if a particular recipient domain has delivery problems. 

Are there problem domains returned when you sort by “Active Recipients?” 

When you sort by Connections Out, does any one domain reach the maximum 
connections specified for a listener? The default maximum number of 
connections for a listener is 600. The default maximum system-wide number 
of connections if 10,000 (set by the 

deliveryconfig

 command). You can 

examine the maximum number of connections for a listener using the 
command:

listenerconfig

 -> 

edit

 -> injector_number -> 

limits

Are the connections for a listener further limited by the 

destconfig

 command 

(either by system maximum or by Virtual Gateway addresses)? Use this 
command to examine the 

destconfig

 connection limits: 

destconfig

 -> 

list

Use the 

hoststatus

 command. 

“Drill-down” using the 

hoststatus

 command on the top domains listed from 

the results listed by the 

tophosts

 command. 

Is the host available and accepting connections? 

Are there problems with one specific MX record mail server for the given 
host?