For a while now, we have been using the Spamhaus Policy Block List (PBL) for some of our spam-fighting needs. Our preferred method for you to identify your dynamic IP space is via the PBL. Please submit and update your dynamic IPs with Spamhaus as needed. Blocking mail that comes from dynamic IPs can be a very effective spam-fighting technique, but only if we all participate!

To manage your dynamic IPs with regards to the PBL, please visit Spamhaus' website. They provide this particular service free of charge.

(And, no, Spamhaus is not paying us to advertise, but perhaps we should charge them. :))

David
Systems Programmer, AOL Postmaster Team