Spam!
Trying to battle spam is a full time job. Recently with a work migration I have been trying to remove our IP’s from SORBS. SORBS has identified our IP as a dynamic pool due to our ISP’s business allocation being in the same class a network as their residential service.
Some great tools:
- Multi RBHL search – http://www.blacklistalert.org/
- IronPort’ s Senderbase – http://www.senderbase.org