A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : DNS Blacklists Considered Harmful
Author(s) : A. Church
Filename : draft-church-dnsbl-harmful-01.txt
Pages : 8
Date : 2005-8-30
As spam continues to grow throughout the Internet, various
countermeasures have been developed. Among these is the "DNS
blacklist", a DNS server configured to return a "good" or "bad"
response to a query on a given IP address; mail servers can be
configured to automatically query such a server and reject messages
which are flagged "bad". If the blacklist is accurate, this allows
mail servers to reject spam without wasting the time of the human
recipient or the resources of the server. However, between delays
in responding to environmental changes and arbitrary operational
decisions by blacklist operators, such blocking of mail in fact
causes significant harm to innocent third parties. This memo
describes the issues concerning these blacklists and suggests ways
to resolve the attendant problems.
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