NJABL maintained a list of known and potential spam sources (open mail relays, open proxies, open form to mail HTTP gateways, dynamic IP pools, and direct spammers) for the purpose of being able to tag or refuse e-mail and thereby block spam from certain sources.
NJABL created a database of known and suspected spam senders, including open mail servers, open proxy servers, open forms that accept email over HTTP, dynamic IP pools, and individual spammers, to be able to tag or reject emails and block spam from those particular sources.