Mail flow in PureMessage for Unix has halted after update to Sophos Anti-Virus for Linux version 9.3.1.
To experience this issue all of the following must be true:
Note: This issue is only affecting a small number of customers.
First seen in Sophos Anti-Virus for Linux 9.3.1PureMessage for Unix
This issue is due to a permission change to a /dev/ device in SAV for Linux that the Milter attempts to access before virus scanning is attempted.
We are currently investigating the issue and will provide further information in this article as required.
If you experience this issue run the following commands to add the PMX user to the sophosav group.
usermod -a -G sophosav <pmx-username>
usermod -a -G sophosav pmx6
If selinux is installed and enabled then an alternative solution may be required. In this scenario the following will resolve the issue.
/opt/sophos-av/bin/savconfig set RestrictProcessexclusions false
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