This article is written like a personal reflection, personal essay, or argumentative essay that states a Wikipedia editor's personal feelings or presents an original argument about a topic. The term "blackhole" refers to a networking black hole , an expression for a link on a network that drops incoming traffic instead of forwarding it normally.

This page was last edited on 19 April , at Read our guide to purchased lists. Some end-users and organizations have concerns regarding the concept of DNSBLs or the specifics of how they are created and used.

The term " Blackhole List" is sometimes interchanged with the term " blacklist " and " blocklist ". When a mail server receives a connection from a client, and wishes to check that client against a DNSBL let's say, dnsbl.