IP 封鎖清單(A filtering list that is used by the Connection Filter agent in Exchange Server 2007. IP addresses on the IP Block list are considered spam. Messages originating from an IP address that is on the IP Block list are stopped from entering the Exchange organization)
即時封鎖清單(A dynamic list that is maintained inside an organization or by a remote third-party organization that contains a list of known unsolicited e-mail sources. The receiving mail server may refuse connections from addresses that are on a RBL)