Cisco Cisco Email Security Appliance C190 Guia Do Utilizador

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

 -> listener_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? 

The 

hoststatus

 command reports the last “5XX” status code and description returned by the host 

if there is a 5XX error (Permanent Negative Completion reply) for the specified host. If the last 
outgoing TLS connection to the host failed, the 

hoststatus

 command displays the reason why it 

failed.

Configure and/or examine the domain debug, bounce, and text mail logs to check if the recipient 
host is available.

Domain debug logs record the client and server communication during an SMTP conversation 
between the appliance and a specified recipient host. This log file type can be used to debug issues 
with specific recipient hosts. 

For more information, see 

. 

Bounce logs record all information pertaining to each bounced recipient.

For more information, see 

Text mail logs contain details of email receiving, email delivery and bounces. Status information is 
also written to the mail log every minute. These logs are a useful source of information to understand 
delivery of specific messages and to analyze system performance.

For more information, see 

Use the 

telnet

 command to connect from the appliance to the problem domain:

mail3.example.com> telnet

Please select which interface you want to telnet from.

1. Auto

2. Management (192.168.42.42/24: mail3.example.com)

3. PrivateNet (192.168.1.1/24: mail3.example.com)

4. PublicNet (192.168.2.1/24: mail3.example.com)

[1]> 1