OpenDKIM errors
Your permissions are too restrictive.
The opendkim
user/group does not have access to the /etc/ssl/private
folder.
Depending on your setup it should be owned by the opendkim
group, and the group should also have read/execute permissions on the folder.
Also the permissions on your key file are too open.
It should have 0600
permission, in no case should it be world readable.