I’ve received this message recently:
error: skipping "/var/log/exim/mainlog" because parent directory has insecure permissions (It's world writable or writable by group which is not "root") Set "su" directive in config file to tell logrotate which user/group should be used for rotation.
…and a few other of similar nature. Turns out /var/log/exim/ were indeed group-writable. Easy to fix.
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