and other SLS...
A SLS service like....
Spamhaus, Spamcop, CBL and are DNS based blacklists.
All these services have one thing in common. The use
the DNS schema to give a heads-up or block result. This
is a very efficient method and conserves bandwidth.
It also can pass through most firewalls.
Spamhaus- Working to protect...
INTERNET NETWORKS WORLDWIDE Spamhaus tracks
the Internet's Spammers, Spam Gangs and Spam Services,
provides dependable real-time anti-spam protection for
Internet networks, and works with Law Enforcement to
identify and pursue spammers worldwide. (Source"
Spamhaus offers different services. The
SBL service actively crawls the web looking for open
relays and maintains a database of known spammers.
The XBL Spamhaus service is a list of
exploits = worms, viruses and trojans. The XBL incorporates
data from two highly-trusted DNSBL providers. The main
- the CBL (Composite Block List) from cbl.abuseat.org
- the NJABL Open Proxy IPs list from www.njabl.org.
We recommend to use the Spamhaus SBL-XBL.spamhaus.org.
This list combines the services and saves you bandwidth.
The latest Spamhaus list is ZEN. It includes
dynamic addresses. It's generally assumed that mail
servers have static addresses. It makes sense because
"real" mail operations want to send and receive
embalm. The Spammers on the other side just want to
send. So it does not matter to them if the address changes.
We recommend the ZEN service but make sure you do not
check the message header for ip addresses. The header
may contain dynamic IP addresses from the senders DLS
connection going to the ISP's mail server.
Remember its spamhaus - not spamhouse
SpamCop determines the origin of unwanted email
and reports it to the relevant Internet service providers.
By reporting spam, you have a positive impact on the
problem. Reporting unsolicited email also helps feed
spam filtering systems, including, but not limited to,
SpamCop's own service. Source: Spamcop.net
Spamcop is a long time spam blacklist service. It is
well balanced and has few false positives. Spamcop gets
it's list by crawling the Internet and from users that
Composite Block List - CBL...
Most use CBL without even knowing. Spamhaus
has integrated it in it's XBL list. Unlike other backlists
CBL does not crawl the web. Instead it monitors many
mailboxes that do not belong to real users. If one sends
a message to these addresses it will blacklist the sender.
This is very effective to catch spammers and specially
I had a few clients that ended up on the list due to
virue infected machines in their office. CBL was very
fast adding them and just as fast removing them once
the problem was under control.
How does XWall
use the blacklists
XWall can use one, two or as many blacklists as you
like. It also can use them in groups. This is helpful
if you want to minimize false positives. In that case
the offender would have to be listed on multiple services
before XWall declares the message spa,. Example: if
you enter zen.spamhaus.org,bl.spamcop.net and the sender
is listed on both Spamhaus and Spamcop XWall will block
XWall not only uses DNS blacklists it also can use
Domain based black lists and the very popular SURBL.
XWall can also use DNS While lists to exclude known
mass mailers that do not mail spam. Click
here to see more XWall features..