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Topic: DNSBL

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	dnsbl.net.au
		Due to rsync problems between the sorbs and dnsbl databases, we have dropped sorbs from t1.dnsbl.net.au.
		The result is a large dnsbl zone with 1.8 million entries (and climbing daily), resulting in a very low rate of false positives.
		There are so many DNSBL links and resources, they needed their own LINKS page.
	www.dnsbl.net.au (1721 words)

	DNSBL - Wikipedia, the free encyclopedia
		A DNSBL is a means by which an Internet site may publish a list of IP addresses, that some people may want to avoid, in a format which can be easily queried by computer programs on the Internet.
		The first DNSBL was the Real-time Blackhole List (RBL), created in 1997 by Paul Vixie and Dave Rand as part of the Mail Abuse Prevention System (MAPS).
		To operate a DNSBL requires three things: a domain to host it under, a nameserver for that domain, and a list of addresses to publish.
	en.wikipedia.org /wiki/DNSBL (1517 words)

	Vamsoft \| ORF Product Features \| DNSBL
		DNSBL: The IP, sender and recipient whitelists and fllists can be imported and exported to and from various text formats, including CSV which can be imported by Microsoft® Excel®.
		DNSBL: Spam is often sent with fake sender email address that does not exist to recipients that are no longer valid, which results in tons of NDR's filling up the mail queue.
		DNSBL: While the whitelists can be used to exclude hosts, senders or local mailboxes from filtering, the same type of fllists help you reject messages from specific hosts or IP ranges, senders (domains) or local mailboxes.
	www.vamsoft.com /promos/dnsbl/default.htm (758 words)

	Understanding DNSBL, SMTP blacklist and Bayesian anti-spam filtering in 602LAN SUITE - Software602
		The first two, DNSBL and SMTP fllist, work by rejecting connections via a list of addresses linked to spamming.
		DNSBL is a method of blocking connections to your server by looking up the remote connection on a list of known spammers or net blocks.
		An advantage of DNSBL is it blocks the actual connection from known spammers; it can save you bandwidth as well as CPU time and storage space to process and store the message.
	www.software602.com /602lan-suite/understanding-dnsbl-smtp-blacklist-and-bayesian-anti-spam-filtering-in-602lan-suite (688 words)

	Spamhaus - Understanding DNSBL Filtering
		A DNSBL (commonly known as a 'Blocklist") is a database that is queried in realtime by Internet mail servers for the purpose of obtaining an opinion on the origin of incoming email.
		DNSBLs are used by the Receiver's private mail server and from within the Receiver's private network.
		In effect the receiving mail server asks the Spamhaus DNSBL "Does this Sender's IP Address exist on the Spamhaus database?", the Spamhaus DNSBL simply responds with a "Yes" if present or, if not present does not respond at all (no response means "we have no opinion on that IP Address").
	www.spamhaus.org /dnsbl_function.html (573 words)

	SORBS (Spam and Open-Relay Blocking System)
		The SORBS DNSBL was born in November 2002.
		On January 6, 2003, the SORBS DNSBL was officially launched to the public.
		Since those initial 78,000 proxies, the SORBS DNSBL has grown to an astounding 3 million listed hosts (that's less than 0.07% of the possible addresses on the internet - statistics correct as of June 2004).
	www.dnsbl.sorbs.net (1125 words)

	njabl.org
		This effort began out of frustration with the amount of spam coming into our networks and with the lack of options for an existing dnsbl with policies and stability we could live with.
		NJABL.ORG maintains a list of known and potential spam sources (open 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 email and prevent at least some spam.
		Our goal is to provide a stable and effective dnsbl with clearly stated and strictly adhered to criteria for listing.
	dnsbl.njabl.org (136 words)

	What is DNSBL? - A Word Definition From the Webopedia Computer Dictionary
		DNSBLs are used to publish IP addresses associated with e-mail spam and spamming.
		An address found in a DNSBL may be directly associated with spam, or may have made the list due to Web server vulnerabilities that can be used by spammers.
		There are many DNSBLs available, each published and maintained by different individuals and organizations.
	www.webopedia.com /TERM/D/DNSBL.html (211 words)

	Spam Statistics - DNSBL Hits
		WhiteList and Passed counts are for each message that is transported to the application level (mail daemon) on a repeating basis.
		Once an IP is entered into the tarpit, it is not possible for it to reach the application level and be counted since the connection to that host is blocked at the IP socket transport level.
		Once the IP address has been added to the SpamCannibal tarpit, it is no longer possible for the application layer to see or count connection attempts for a host.
	www.spamcannibal.org /dnsbl_stats.shtml (634 words)

	irtf-asrg-dnsbl-02.txt
		DNSBLs that return multiple values often have multiple test addresses so that, for example, the entry for 127.0.0.5 returns a 127.0.0.5 A record and corresponding TXT record.
		DNSBL clients are most often mail servers or spam filters called from mail servers.
		Conversely, if a DNSBL manager removes all of the entries (which has also happened), systems that depend on the DNSBL will find that their filtering doesn't work as they want it to.
	ietfreport.isoc.org /idref/draft-irtf-asrg-dnsbl (2277 words)

	SRUTI '06 Abstract
		This paper studies the prevalence of DNSBL reconnaissance observed at a mirror of a well-known fllist for a 45-day period, identifies the means by which botmasters are performing reconnaissance, and suggests the possibility of using counter-intelligence to discover likely bots.
		We initially expected that most DNSBL lookups would be third-party lookups, as described in Section 2.2.1, and that we would be able to validate the queried nodes as being known bots.
		DNSBL queries issued by mail servers are often performed by directly querying the DNSBL, rather than relying on a local resolver.
	www.usenix.org /events/sruti06/tech/full_papers/ramachandran/ramachandran_html (4357 words)

	DNS Blacklists Laced with Personal Agendas (Site not responding. Last check: )
		DNSBL's are databases of servers and networks which can help spam filters figure out if a sender is a likely spam source.
		When a DNSBL is sent the address of a server or network, it responds with an IP address that indicates if it's included on the list of likely spammers.
		Users and system administrators should be aware of what anti-spam fllists their software relies on, and generally avoid trusting any individual DNSBL to be the final decision if an email is spam or not.
	www.spambutcher.com /new/dnsbl (423 words)

	[No title] (Site not responding. Last check: )
		This document describes the structure, operation, and use of DNSBLs and DNSWLs but does not describe or recommend policies for adding or removing addresses to DNSBLs and DNSWLs, nor does it recommend policies for using them, nor does it take a position whether the DNS is the best way to distribute such data.
		If the DNSBL were called doms.example.net, and the domain invalid.edu were to be listed, the entry would be named invalid.edu.doms.example.net.
		Name-based DNSBLs are far less common than IP based DNSBLs, There is no agreed convention for a test entry nor for wildcards.
	www.faqs.org /ftp/pub/internet-drafts/draft-irtf-asrg-dnsbl-00.txt (2077 words)

	Blacklists, Blocklists, DNSBL's, and survival: How to survive as a non-combatant in the Spam Wars.
		In the past, most mail rejections due to DNSBL listings were clear about their nature, because the DNSBL was itself cited in rejection messages and often the TXT record associated with the l;isting was used as well.
		The IP address is believed by the DNSBL maintainer to be in a block of addresses assigned at some level to an ISP who is not acting to disconnect spammers from their network.
		Note that the DNSBL's like SPEWS which use criterion #6 do so openly, and their users (people running MTA's) presumably understand that they are using a list which includes addresses that are not known to send spam.
	www.scconsult.com /bill/dnsblhelp.html (9618 words)

	Glossary definition for DNSBL
		DNSBLs typically list open relays and servers which can be used for RNDR attacks.
		DNSBL can be created and customised within a company, but there are also third party DNSBL services available on the internet.
		DNSBL are sometimes also referred to as RBL or simply BL.
	www.cryer.co.uk /glossary/d/dnsbl.htm (197 words)

	[No title]
		Note: Modest Software is not associated with any particular DNSBL maintainer, and many of them ask for a donation in return for use of their services.
		Some DNSBL maintainers do require payment before you are able to use their services.
		The REFUSE option for DNSBL handling; this setting causes the connections to be pre-empitvely dropped so that messages are not accepted at all.
	www.modestsoftware.com /m9_DNSBLSURBL.cfm (507 words)

	Quantitative Evaluation of DNSBLs
		Here are counts of messages that would be blocked by each of 16 DNSBLs, out of 86,252 messages to actual users at nber.org during the last week of February 2005.
		We also have runs where the DNSBLs were consulted several days after the mail was presented, and the blocking rates are substantially lower.
		With a DNSBL it is quite easy to reject a message, and all false positives will be returned to the sender (rather than disappearing into the ether).
	www.nber.org /sys-admin/dnsbl-comparison.html (1245 words)

	DNSBL Resource - All About Blacklists: What is a DNSBL?
		Most mail servers nowadays have DNSBL support (either built in, or through use of a plug-in) that allows a mail server administrator to block mail from sites listed on a specific DNSBL.
		More recently, DNSBLs are often used as a part of spam scoring system, such as SpamAssassin.
		The first DNSBL was called the RBL, created by a company I once worked for, the Mail Abuse Prevention System (MAPS).
	www.dnsbl.com /2007/01/what-is-dnsbl.html (329 words)

	DNSBL Resource - All About Blacklists
		A lot of people have asked how the spam and ham (non-spam) data is compiled for the Blacklist Statistics Center here at DNSBL Resource.
		Here's an updated overview of what goes in to the spam and ham (non-spam) feeds here at DNSBL Resource.
		McFadden Associates has been publishing two different, spamtrap-driven DNSBL zones since October 2003.
	www.dnsbl.com (1500 words)

	Руководство по SpamPal: Дополнение списков DNSBL
		Чтобы сделать это, щелкните по кнопке "Дополнительный файл DNSBL" на панели "Расширенный" диалога с опциями, будет вызвано окно текстового редактора, и Вы можете редактировать файл с определениями дополнительных услуг DNSBL.
		Рекомендуется для именования списка DNSBL использовать не более семи символов.
		список услуг DNSBL включает спаммеров, операции поддержки спаммеров, открытые ретрансляторы и хосты с dialup.
	www.spampal.org /manual-rus/extradnsbl.html (275 words)

	KLOTH.NET - Multi DNSBL-check - Look up IP addresses in DNS Blackhole Lists
		For any removal follow the link in the output to the homepage of the respective DNSBL maintainer and read the published instructions carefully.
		Inclusion of a DNSBL to be checked here does not imply any endorsement or recommendation to use that list in your own productive spam fighting environment.
		-- t1.dnsbl.net.au - dnsbl.net.au - Australian DNSBL - they are firewalling this innocent script (2007-02-17), yikes!, leading to meaningless negatives.
	www.kloth.net /services/dnsbl.php (479 words)

	RBL - ASSP Wiki
		Because it is a registered trademark of a service, it is not the appropriate term to use to generically refer to DNSBL services.
		While this article is identically detailed, it would be more appropriate to read the DNSBL version of this article.
		DNSBL is a database of IP addresses of UBE sources, verified spam services and open SMTP relay servers.
	www.asspsmtp.org /wiki/Rbl (2249 words)

	DNSBL Servers (Site not responding. Last check: )
		DNSBL servers maintain lists of IP addresses of spam friendly servers.
		These servers are said to be flholed by that DNSBL server.
		Some DNSBL servers are simply not usable, and list nearly the whole Internet range of IP's, and others are much more conservative.
	www.spamsmiter.com /DNSBL.htm (184 words)

	dnsbl.epaxsys.net DNS Email BlackLists (Site not responding. Last check: )
		NOTE: Usage of any ePaxsys DNSBL Zone is by request and by contract only.
		These DNSBL zones are not open to the public.
		These DNSBL's are Hosted and Maintained by FRWS and its staff.
	www.epaxsys.net /dnsbl (621 words)

	NANAE FAQ: Understanding NANAE (Site not responding. Last check: )
		DNSBL stands for "Domain Name Service-delivered Blocking List" (or "DNS-delivered Blackhole List") and refers to the delivery mechanism more than the content of the list itself; the list data is queried using the standard DNS protocol usually used for turning hostnames into I.P. addresses.
		To query a DNSBL list for a certain I.P. address, you reverse the address, prepend it to the zone name, and make a DNS query for the result.
		By having your mailserver check the source of mail against a DNSBL service, the hope is that mail from spam-friendly providers can be rejected (since it's probably spam), while other email is allowed to pass unmolested.
	www.spamfaq.net /terminology.shtml (9177 words)

	Using SORBS (Site not responding. Last check: )
		The SORBS DNSBL is just list of numbers, nothing more, nothing less.
		The significance of these numbers is that they are related to hosts on the Internet whose condition/settings have included the particular vulnerabilities which we seek to eliminate, i.e., open relays, open proxies, etc.
		As the policy of SORBS (and one of the reasons for creating SORBS) was the publishing of data that is fully under SORBS control, the SPEWS zones are not included in the SORBS aggregate zone.
	www.dnsbl.us.sorbs.net /using.shtml (930 words)

	Review of Vamsoft's Open Relay Filter and Eight DNSBL's
		Although DNSBLs are easy to use by scripting into common UNIX -based email software like Sendmail, users of Windows -based servers have not been so lucky.
		The DNSBL (also known as an RBL or Real-time Blackhole List) is maintained in the form of IP zone data on a particular DNS server or hierarchy of servers.
		A successful DNS lookup from a DNSBL indicates the email is originating from a server that could be a spam source, and that the email should probably be rejected.
	www.bytebrothers.org /OpenRelayFilter.htm (4426 words)

	aspNetPOP3
		You grab the IP address an email came from, query a special DNS server, designated as a DNSbl, and the DNS server's response tells you if the IP Address is a previous source of spam.
		This object is responsible for DNSbl lookups and parsing.
		Blitzed is an IRC network, and therefore the DNSBL was originally focused on and built from evidence of IRC abuse.
	www.aspnetpop3.com /dnsbl.aspx (2081 words)

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