Scanner Failure to Route Messages to Spam Quarantine Due to SMTP Error Code 551 5.4.6

Products

• Messaging Gateway

Issue/Introduction

When scanning emails, messages fail to be routed to the spam quarantine, resulting in the SMTP error code:

551 5.4.6 [internal] private/loopback address

Upon investigating the agentconfig.xml configuration file, you discover that the quarantine server is set to a loopback address:

<quarantineHost>[127.0.0.1]:41025</quarantineHost>

Cause

The issue arises because the quarantine server is incorrectly set to 127.0.0.1, which is a loopback address. This prevents external scanners from communicating with the quarantine service, causing message routing failures.

Resolution

To resolve this issue, apply modifications to the Control Center’s Ethernet interface. These modifications will trigger an update in the agentconfig.xml file, replacing 127.0.0.1 with the actual IP address of the Control Center.

Steps to Fix the Issue:

1. Modify the Control Center Ethernet Interface:

• Change the IP address of the Control Center.
• Alternatively, add a second network interface to the Control Center.

                  2. Verify the Update in agentconfig.xml:

• After making the changes, check the agentconfig.xml file.
• The <quarantineHost> entry should now reflect the Control Center’s actual IP address instead of 127.0.0.1.

                  3. Restart Services:

• Restart the mail scanning and quarantine services to ensure the changes take effect.
• If necessary, restart the Control Center for the configuration update to apply correctly.

                  4. Test Message Routing:

• Send a test spam message to verify that it successfully routes to the quarantine without triggering the 551 5.4.6 error