> On Wed, Sep 17, 2025 at 01:50:53PM -0400, Michael B. Justice via Exim-users
> wrote:
> > As part of my investigation I've opened the maildir directories up
> > to all (777)
>
> Has this in fact resolved the issue?
>
> What OS kernel is this based on? If Linux, I'd focus my suspicion on various
> non-Unix access controls such as SELinux.
On modern Linux versions, one important additional place to check
(beyond SELinux and/or AppArmor) is in the systemd .service file for
Exim. Your distribution may have turned on various systemd protections
that can do things like give Exim (running as a service) its own
isolated /tmp directory tree. I know that Ubuntu has started to do this
in recent Ubuntu releases.
(Systemd settings like 'PrivateTmp' can also complicate debugging
programs started from Exim, including in people's .forwards.)
- cks
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