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The
XWall Exchange server spam filter features Bayes and Heuristic
(Spamassassin™) modules:
The place to filter your e-mail is before the mail enters
your Exchange server. XWall is specifically designed to do
just that. Consider XWall something like the air filter of
your car. Just like the air filter protects your engine from
harm, so does XWall protect the Exchange server by filtering
the mail before the Exchange server ever sees it. It's a self-contained
program in front of the Exchange server. XWall can be used
on the same machine or a separate system to give you the ultimate
flexibility.
SUPPORTED
SERVERS: Its implementation is simple. XWall takes the
place of your mail server and receives the mail on port 25
(SMTP). XWall then filters out the spam and junk mail and
passes the clean mail on to a mail server like Exchange, SMTPBeamer,
Imail, Lotus Notes, Groupwise and so on. See the list
here......
EASY
INSTALL: XWall can be installed on a separate computer.
In that case, there is no need to modify your existing mail
server in any way. Also, you may operate XWall on a system
you placed outside the firewall. Of course, XWall also can
run on the same system together with your Microsoft Exchange
 server
and many other SMTP servers. The only requirement is a user-definable
SMTP port on the mail server. Installing XWall and taking
it for a spin is quick and easy. Extract the program, run
the setup and answer a few questions. Make sure you know where
your Exchange server is and have an address for a fully
qualified DNS server handy. If your situation is not the norm,
our tech support will be available. Many questions are answered
in our FAQ's here at the Emailprofessor
and Ceratec.net.
  SPAM
RELAY FILTER: XWall features a number of filters and supports
several Relay Black List services right out of the
box (ORDB, Spamcop, Spamhaus). To insure minimal false positives,
you may enable group testing. A group contains 2 or more spam
services. The e-mail is only considered spam if it fails all
members of the group. If a message is considered spam, XWall
lets you choose several different actions. These actions are
independent of other filters.
 SURBL:
Has evolved from the SLS services. Unlike testing the SMTP
ports for open relays the SURBL service lists the spam supported
web sites. XWall searches the e-mail for links to web sites.
When it finds a link it checks with SURBL if that site is
listed. This filter is very effective at stopping pharmacy spam
 The
Greylisting Filter is simple and effective by nature. The
filter stops any message from an unknown source and issues
a "temporary mail handling problem". The typical
RFC compatible SMTP server will retry delivery and XWall will
let the message pass. Most spammers, however, will or cannot
re-send the message. For more information check this link.
http://projects.puremagic.com/greylisting/
 Now
there is a new way of handling unknown virus treads and the
pesky stock quote spam attacks. The new CENTRAL CHECKSUM
SERVICE filter in XWall is just the tool you have been
waiting for. We've seen many viruses literally outrun the
virus scanner. At best, one of the Norton's & Co. would
claim to be the fastest to stop the virus, but that was after
the virus that did billions in damage. The XWall Central Checksum
Service is very different and much faster.
 THE
HEURISTIC FILTER: a.k.a. Spamassassin™. The Heuristic
filter is calculating the possibility of the message being
spam by considering a number of factors like words, subject,
headers and more. Unlike the Bayes filter, it does not need
to learn and can be implemented right out of the box. For
best protection, we recommend to use both the Heuristic and
the Bayes learning filter.
 THE
BAYESIAN FILTER: This filter is a major step forward.
To fully understand this filter, we recommend reading Paul
Graham's White Paper. In addition, XWall
also contains an exclude table. It allows you to let a user
or a domain send mail through the filter even if they are
on a black list or have criteria which filters would catch.
As with the other two filters, the Bayesian filter offers
an exclude table as well as an independent action table.
 Phishing
the new buzzword. You did hear about it the news. Basically,
it's Spam with a criminal element added. These emails seem
to come from your bank, Ebay and so on. XWall examines each
email for signs of phishing. lt detects false links where
the displayed link is different from the real one. It also
detects senders that do not send from the correct servers.
 Tar
pitting is used to prevent address harvesting attacks. It's
done by adding delays in certain SMTP functions making it
too time consuming for the attacker to find valid addresses
 Once
Microsoft endorsed SPF Sender Permitted Filtering is rapidly
gaining acceptance. The filter checks a text record in the
DNS record. This text record tells the filters which domains
are permitted to send email from that server. The more admins
add the record to their own domains the better the filter
will work. For more information check http://www.openspf.org
 Virus
scans for Exchange are expensive. A standard scanner typically
will not work to scan email at the server. The problem is
the mime encoded message hides the virus from the scanner.
XWall assembles the message and an inexpensive on-access scanner
can now find the virus. Xwall works with Norton, E-Trust (CA),
F-Prot, McAfee, Panda, FSecure, Bit Defender, PC-Cillin, Norman
and many others. Please note Norton, McAfee and some other
packages incluse things like firewalls. Make sure they are
turned off or correctly configured.
 XWall
BLOCKS: XWall has a from/to address filter and compares
each address with your list. It also can filter domains, partial
and full addresses. XWall includes a subject, word, phrase
and string filter. You can block IP addresses. Attachments
can be filtered by their extensions. XWall takes extensive
measures to avoid false positives via the manual and automatic
exclude lists. To get you going faster, XWall has preset subject
and word lists. The blocks have their own action if a message
fails the test.
 SPAM
ROUTING: If XWall finds any virus, spam or junk mail content,
it can stop and delete the message or forward it to a selected
person, usually the postmaster. XWall also can send a message
to the sender informing him about the blocked message due
to a virus, spam or junk mail status. XWall offers a variety
of options to handle undesirable mail.
 SMTP
RELAY: Worried about ending up on an open relay list yourself?
XWall does offer SMTP relay to your in-house and external
users. The SMTP relay in XWall can be protected in many ways.
It will start by disabling the relay altogether if you don't
need to relay, or you can authenticate all users through NTML
(NT/ Win2000 domain users). Also, you may set a general user
name and password, and you can restrict access to certain
IP address ranges.
 AUTOMATIC
WHITELISTING: Automatic whitelisting is a great feature
available in XWall. It automatically adds the e-mail address
of every outgoing message to the exclude list. The reasoning
behind this idea is that if you send e-mail to someone, it's
likely that you want that person to be able to reply. It's
a very welcome feature if you implement more aggressive RBLs™
The Auto white list can be kept companywide or for individual
users.
 Do
you need to make sure all outgoing email has your legal disclaimer.
XWall will attach such a disclaimer to all outbound mail.
You can have different email disclaimers for different users.
It can be plain text or HTML.
  Like
to S/MIME sign outgoing mail. XWall can do it for you. But
instead of tracking down every Outlook, you only need to install
the certificate in XWall. How about encrypted email? Is this true
for encrypted email? Yes - XWall is able to encrypt your email
at the server level.
 Using
the ESATInformer optional add-on gives you an inside look
at your spam situation. You see where spam comes from and
where is goes. You see how effective your filter settings
are and you see what messages your users retrieve.
 ESATInformer
prevents false positives in a dramatic way. All or selected
users receive a spam report every day. The report is clearly
formatted and shows all the message senders and subjects.
The user then can retrieve any message he needs.
 ESATInformer
allows the user to automatically retrieve messages blocked
by XWall unless the message contained a virus or dangerous
attachment. The process utilizes ESAT's web interface or Pop3
mail box.
 Spam
free server is now a buzzword. Unlike many other spam solutions
the XWall / ESAT combination keeps the detected spam out of
your Exchange or mail server and automatically deletes it
after a set number of days. Just imagine how your Exchange
performs with 80% less mail load. ... and how about the backup?
It will take a fraction of the current time and tape.
RBL/SLS
Spam services supported by XWall
(partial listing)
Recommended DNS-based services
SLS=bl.spamcop.net
SLS=sbl-xbl.spamhaus.org
Additional DNS-based services
SLS=zen.spamhaus.org
SLS=dnsbl.sorbs.net
SLS=multi.surbl.org
SLS=blackholes.intersil.net
SLS=blackholes.five-ten-sg.com
SLS=dnsbl.njabl.org (use zen.spamhaus.org)
SLS=bl.csma.biz
SLS=sbl.csma.biz
SLS=flowgoaway.com
SLS=multihop.dsbl.org
SLS=cbl.abuseat.org
SLS=opm.blitzed.org
SLS=blackhole.securitysage.com
SLS=dnsbl.ahbl.org
SLS=relays.bl.kundenserver.de
SLS=dnsbl.rangers.eu.org
SLS=bl.spamcannibal.org
Domain-based spam services
- whois.rfc-ignorant.org
- rhsbl.sorbs.net
Exclude & approve services
- SPF Sener Permitted From
- spl.pobox.com
These are a few examples. The lists change constantly.
(August 7, 2007)
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The
XWall program effectively represents a firewall for your mail
server. XWall is a solid, well-established mail filter and
is found in many Fortune 1000 companies and government agencies.
COMPATIBILITY:
XWall operates on all current Windows platforms including
Windows XP and all Microsoft Windows server products. Its
efficient, 32-bit code with a multi-thread approach can process
mountains of e-mail on a daily basis. Systems with a 2.4 GHz
or higher Athon or Pentium may handle over 100,000 emails
a day. XWall can be installed as a service. If your mail server
is not Windows based, XWall can filter your email on a separate
system ahead of the mail server.
BONUS
FEATURES: XWall includes tools not directly related to
spam but features that are valued by many companies. XWall
offers extensive and detailed logs and statistics. Originally
designed for easy trouble shooting, the logs can be used to
extract a wealth of information. XWall can archive all your
e-mails—a feature requested by many large companies today.
XWall makes the lawyers in your company happy. It can attach
a disclaimer to all outgoing messages.
TECH
SUPPORT: The EmailProfessor offers phone, e-mail
and fax support for our US and Canadian customers. This includes
pre sales support. You will find our contact information on
the bottom of all pages. Additional tech support via e-mail
is available directly from DataEnter.
Our XWall forum
is open to all XWall users. If your situation does not allow
you to do installation and testing during normal business
hours, the EmailProfessor offers after-hours support by appointment.
TRY
IT RISK FREE: We are striving to provide an Exchange server
spam filter that is in a class by itself. Try the XWall junk
mail and spam filter free of charge for up to 30 days. The
full version is available as a download. We're available for
pre and after sales support. If you decide to buy, please
follow our online links to purchase XWall with your credit
card or through PayPal. You may fax us your purchase order
at (512)-285-8500 or (512) 287-4055. We will supply you with the registration
key to fully license your XWall installation. XWall is licensed
per server (that's the machine XWall runs on). There is no
limit regarding the number of mail accounts or users in your
company. Compare XWall to any competitor, and you will find
that our features and price are unmatched.
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