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Q0511
Whenever my system filter uses a mail command to send a message, I get
the error User 0 set for address_reply transport is on the
never_users list. What does this mean?
The system filter runs as root in Exim 4, unless you set system_filter_user to specify otherwise. When you set up a delivery direct from a system filter (an autoreply is a special kind of delivery ) the transport runs as the same user, unless it has a user setting of
its own. Normally, deliveries are not allowed to run as root as a
security precaution; this is implemented by the never_users option
(see Q0039). The easiest solution is to add
this to your configuration:
system_filter_user = exim
The system filter then runs as exim instead of root. Alternatively,
you can arrange for autoreplies from the system filter to use a special
transport of their own, and set the user option on that transport.
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