IronPort - daily management guide - AsyncOS 7.6.1

Chapter 9 Testing and Troubleshooting
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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]> 3
Enter the remote hostname or IP.
[]> 193.168.1.1
Enter the remote port.
[25]> 25
Trying 193.168.1.1...
Connected to 193.168.1.1.
Escape character is '^]'.
Troubleshooting Delivery
Troubleshooting Delivery
If you cannot connect from one interface to another, you may have issues with the way in which the
appliance’s Management and Data1 and Data2 interfaces are connected to your network. Ensure that
the telnet service is enabled on the target interface if you are attempting to connect using telnet. See
Appendix A, “Accessing the Appliance” for more information. You can also telnet to port 25 of the
listener and enter SMTP commands manually (if you are familiar with the protocol).
Examine the IronPort text mail logs and injection debug logs to check for receiving errors.
Injection debug logs record the SMTP conversation between the appliance and a specified host
connecting to the system. Injection debug logs are useful for troubleshooting communication
problems between the appliance and a 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 Using IronPort Text Mail Logs, page 5-8 and Using IronPort Injection
Debug Logs, page 5-23.
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?”
Cisco IronPort AsyncOS 7.6 for Email Daily Management Guide
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