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Am I correct in thinking that this line

2014-05-28 13:22:50 failed to open /etc/backupmxhosts for linear search: Permission denied (euid=47 egid=12)

is telling me that the user that is trying to open this file (and failing) is the user with ID of 47 and is a member of group 12?

If this is true, in order to fix the mucked up permissions, can I look in /etc/passwd and find which user:group these refer to, and chown the file back to them?

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  • Yes. euid and egid refer to the /etc/passwd and /etc/group correspondingly.
    – Kondybas
    May 28, 2014 at 14:16

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It means the exim mail server process is running as user 47 and group 12 (probably exim:mail). It's trying to read the file /etc/backupmxhosts as part of its delivery process, but the permissions of that file are such that the user:group (exim:mail) cannot read it, or it could be a symlink to a non-existent file. Fix your ownership and/or permissions of that file.

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