Following the update to Messaging Gateway (SMG) 10.7.5, the SMG systems begin sending admin alert messages from "bad-msg-monitor" with the subject "Bad message found":
Subject: Bad message found
The Symantec Messaging Gateway has determined that one or
more email messages are destabilizing the filtering process.
These messages are listed below and have been placed into
the Bad Message queue.
You may view and act on these messages from the command line
with the mta-control bad-msg command set.
Refer to the Symantec Messaging Gateway Administration Guide
for more information about the mta-control command.
Time: Tue, 02 Nov 2021 21:17:10 -0700
A defect in SMG 10.7.5 is preventing messages with an empty Subject header from being processed by the URL modification feature.
Release : 10.7.5
Component : URL modification
This issue is resolved by applying patch 10.7.5-290 as follows:
1. Log into the admin command line via ssh or putty
2. Run the patch list command to confirm that patch 10.7.5-290 is accessible
smg [10.7.5-4]> patch list
sms-appliance-patch.x86_64 10.7.5-290 symrepo_smg_patches
3. Install patch 10.7.5-290 by running the patch -p 10.7.5-290 install command
smg [10.7.5-4]> patch -p 10.7.5-290 install
Messages with an empty Subject header can be exempted from URL modification processing by adding a clause to the URL modification content filtering policy similar to the entry below:
As with all changes to Content Filtering policies, any change should be carefully tested using a limited set of test users before applying the change to larger groups of end users.