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Defining DNSBL's, Blacklist, RBL's, SPF, and RHSBL.
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Blacklist and Blocklist:
This is general term describing a list of any type used to block individuals or groups. It can be a less technical list,
a strictly formated digital list/database, or a proprietary formatted list. Broadly it refers to any list which is used
to deny services, communication, information, or goods for a particular reason.
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DNSBL:
A Domain Name System based/block list (DNSBL) contains information about DNS zones. Information reguding IP Addresses
exploitive and bad behavior (sending spam,viruses,etc.), and various DNS records is maintained. They vary in complexity
sometimes containing TXT records for further information. Their sole purpose is to maintain a record of people's computers
that apparently have a history of doing 'bad' things. It is easy to maintain this sort of blacklist, however your reliablity
of who is doing bad things is very important, though making and distributing the list is usually simple. If you have a high
level of statistical reliability, other network administrators may use your list if it is publically avalible. Almost all the
lists carry disclaimers, are offered "as is", and are freely avalible. This Often grants them immunity against large
corperations who threaten the maintainer of the list. Most of the time if you are not a repeat offender, and you ask nicely
you can get a email address, ip, domain, etc. removed rom the lists. Some maintainers do automated testing regauding your
application for removal to check to make sure your email server has basic security (such as releay turned OFF). There are
many people and groups who maintain DNSBL's according to different standards, at varying qualities of service, sizes and
statistical relability. Therefore you can be blacklisted by various sources, requiring you to contact serveral individuals
to try and be removed from the list.
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RBL:
A Realtime Blackhole List (RBL) is an early type of blacklist designed by Paul Vixie (1997). It was one of the first type of
popular digital blacklists that was widely distributed. This was later ran by a Mail Abuse Prevention System (MAPS). Like
Xerox has the same generic meaning as a photocopy since they popularized the technology, RBL is often synonomous with the
term DNSBL.
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RHSBL and RDNSBL:
A Right-Hand Side Blacklist and Reverse Domain Name System based/block list (RDNSBL) are lists that are a DNSBL variant.
RHSBL and RDNSBL use domain names of a reverse DNS resolution to IP addresses, instead of IP addresses to domain names (DNSBL).
There are many lists of black lists that contain information, and sometimes checking against multiple blacklists through
automated services. As far as I know of this writing they are not required to be listed anywhere in a "Master List". Some good ones are:
References:
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OpenRBL
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DNSBL Toolbot
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DNSBL basics at Solid Clues
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