I signed up my server IPs. Within minutes I got tons of email complaints all from one user who had his default forwarder go to his aol account. When SPAM came, he reported it but it seemed to give our servers and domains bad points. In either case, knowing about this was great, I contacted the client and he has changed his ways. I thought others may benefit from this URL.
Good advice, also make sure your reverse DNS works for your IP as AOL won't accept from non-resolving IP addresses these days. They are also beginning to make use of SPF so it's an idea to add the TXT records to your DNS zones to stop/slow any JoeJob runs.