This
is a directory of Anti-Spam sites
featuring many direct links to search
their Blacklist databases. Simply
enter the IP of your sendmail and
see if your IP is listed.
SpamCop blacklist link:
http://spamcop.net/bl.shtml
MAPS blacklist link:
http://www.mail-abuse.org/cgi-bin/lookup
Open Relay blacklist link:
http://www.ordb.org
Relay Stop List blacklist link:
http://relays.visi.com/
Distributed Server Boycott List
blacklist link:
http://dsbl.org
WireHub blacklist link:
http://basic.wirehub.nl/spamstats.html
- http://informatie.wirehub.net/error/dynablock.txt
SPAMHaus blacklist link:
http://www.spamhaus.org
SPEWS.org blacklist link:
http://www.spews.org/
Osirusoft blacklist link:
http://relays.osirusoft.com/cgi-bin/rbcheck.cgi?addr=
Monkeys.com blacklist link:
http://www.monkeys.com/anti-spam/filtering/
Blitzed.org blacklist link:
http://www.blitzed.org/
Has to do with IRC (chat)
WebTV blacklist link:
http://info.webtv.net/spam/
SPAMbag blacklist link:
http://www.spambag.org/query.html
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What
is a Blacklist?
A Blacklist is a database of known
internet addresses (or IP's) used
by persons or companies sending
spam. Various ISP's and bandwidth
providers subscribe to these blacklist
databases in order to filter out
spam sent across their network or
to their subscribers.
There are several Internet organizations,
possibly most prominently MAPS,
who maintain lists of IP addresses
that are known in some way to support
spammers (having open relays, hosting
Web sites, distributing marketing
spamming software, etc.). If you
operate a mail server, usually there
is something in its configuration
(e.g., Sendmail's rulesets) which
can consult these lists, called
"blacklists" or "blocklists," in
an automated way when receiving
a piece of mail. Usually this takes
the form of a DNS lookup of a specially
crafted name. For example, if MAPS
discovers there's an open relay
at address 10.20.30.40, they will
put an entry for 40.30.20.10.relays.mail-abuse.org
in their DNS servers. When your
mail server is receiving mail, it
calls the operating system to ask
it what the IP address of the email
client is, comes up with 10.20.30.40,
then does a nameserver (DNS) query
for the above string. If your mail
server gets an expected response,
it throws an error back to the email
client, and refuses to accept the
email. If instead it gets back an
error (due to no record being there
for example), it assumes the email
is coming from an OK source and
proceeds. As a form of even more
severe punishment, some of the blacklist
organizations distribute Internet
routing information (BGP data) that
cause ALL IP traffic from these
networks to be effectively discarded.
Effectively, this forms an Internet
"blackhole" (it's unreachable from
your network).
Since many spams originate from
"throwaway" dialup accounts, and
sometimes DSL or cable modems, another
list that MAPS maintains is a list
of blocks of addresses (netblocks)
which ISPs have assigned to their
dialup, cable modem, or DSL customers.
These are somewhat effective, but
often perfectly legitimate emailers
send email autonomously (that is
to say, without using their ISP's
email relay). As long as you are
the one running the email server,
this can be effective. If your ISP
receives and stores (or forwards)
email for you, this will be of no
use, because the address from which
the mail will be coming is your
ISP, and it's pretty much a given
that your ISP won't be on the RBL
(realtime blackhole list). Back
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