Cisco Cisco Email Security Appliance C190 Guía Del Usuario
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Cisco AsyncOS 8.0.2 for Email User Guide
Chapter 36 Testing and Troubleshooting
Troubleshooting Email Delivery From the Appliance
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
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
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.
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.
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.
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)
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