_SYSTEMD_UNIT = opendkim.service
[A-Z0-9]+: (bad signature data|failed to parse [Aa]uthentication-[Rr]esults: header field)
-[A-Z0-9]+: key retrieval failed \(s=[\w._-]+, d=[\w._-]+\): '[\w._-]+' record not found
+[A-Z0-9]+: key retrieval failed \(s=[\w._-]+, d=[\w._-]+\)(: '[\w._-]+' record not found)?