Whitelists and blacklists of senders can be created. The categories can be overridden through individually managed blacklists and whitelists. Spamhaus distributes the lists in the form of DNS-based Blacklists (DNSBLs) and Whitelists (DNSWLs). Many casino gambling portals and player forums maintain blacklists of rogue casinos. Password blacklists are lists of passwords that are always blocked from use. It is capable of blocking incoming and outgoing connections based on IP blacklists. The url filtering capabilities of DansGuardian depend largely on the Blacklists, several options are available. Others started DNS-based blacklists of open relays. Many relays were closed, or were placed on blacklists by other servers. Most of those on the security blacklists were Serbs or married to Serbs. The relationship between the former and any national or international IMEI blacklists is unclear. The panel blamed the violence on a government 'shoot-to-kill' policy based on flawed blacklists. IVF increasingly appears on NHS treatments blacklists. When the delivery man sees Elaine there, he blacklists Ned from the restaurant, too. Next, Talbot simply blacklists Hollis and his acts from the venues she controls.