User-Agent: OpenDKIM-Filter/2.10.3
Version: 0.1
...
Delivery-Result: other
Feedback-Type: auth-failure
Auth-Failure: signature (signature verification failed)
DKIM-Failure: signature
...
DKIM-Canonicalized-Header: (base64 string)
DKIM-Canonicalized-Body: (another base64 string)

cc: Alice A <alice.a@mydomain.com>,
        Bob B-B <b-b@mydomain.com>,
        "'Charlie C'" <charlie@theirdomain.com>

cc: Alice A <alice.a@mydomain.com>,
        Bob B-B <b-b@mydomain.com>,
        "'Charlie C'"
        <charlie@theirdomain.com>

cc: Alice A <alice.a@mydomain.com>,
        Bob B-B <b-b@mydomain.com>,
        'Charlie C' <charlie@theirdomain.com>