Evict the spammers from your inbox

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Evict the
Spammers from
Your Inbox

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Spam, commonly defined as unsolicited commercial
email, is a powerful advertising channel for many
products and services. As a result, spamming has
become a profitable business, driven by the low cost of
sending email compared to other direct marketing
techniques. The high return on investment for
spammers has resulted in an overwhelming volume of
unwanted messages in personal and business email
boxes. Consider this: Conducting a direct mail campaign
costs an average of $1.39 per person, meaning that a
response rate of 1 in 14 is necessary just to break even
on a product with a $20 gross profit. Selling the same
item via unsolicited spam email costs only $0.0004 per
person, meaning that a response rate of 1 in 50,000
gets the seller back to break-even; anything above that
is gravy. With profit margins like these, its easy to see
why spammers will try anything to get past anti spam
technology to deliver their messages to your inbox.
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
Types of Spam Threats
The recent onset of fraudulent spam variants such as phishing
and spoofing pose an even greater risk than the spam volume
clogging email servers. Spammers use techniques such as
phishing and spoofing to fool users into opening messages that,
at first glance, appear innocuous.
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 Phishing
Phishing is a specific type of spam message that solicits
personal information from the recipient. Phishers use social
engineering techniques to fool end users into believing that the
message originated from a trusted sender, making these attacks
especially dangerous because they often con victims into
divulging social security numbers, bank account information or
credit card numbers. In one six-month period from November
2003 to May 2004, phishing attacks increased in frequency by
4000%, and the trend continues upward.
An example of phishing is an email that appears to come from a
bank requesting that users log into their account to update or
correct personal information. When the users follow a link
embedded in the email, they are redirected to a site that looks
and behaves like the expected bank website. However,
unbeknownst to the soon-to-be identity theft victims, the site is
actually controlled by the scam artists who sent the email; any
and all information entered by the victim can now be used in a
variety of ways, none of them good.
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 Spoofing
Spoofing is a deceptive form of spam that hides the domain of
the spammer or the spam's origination point. Spammers often
hijack the domains of well-known businesses or government
entities to make spam filters think the communication is coming
from a legitimate source.
Today's spammers are more crafty than ever before and have
begun blending elements of both phishing and spoofing into
their messages, further spinning their web of deception. The
toxic combination of spoofing and phishing presents a major
threat that can trick most anyone into providing personal
information to a stranger.
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 Toothless Legislation
On January 1, 2004, President Bush signed into law the
Controlling the Assault of Non-Solicited Pornography and
Marketing Act of 2003, or CAN-SPAM Act. While well
intentioned, CAN-SPAM has done little or nothing to curb the
flow of unwanted email. In fact, an estimated 97% of all spam
email sent in 2004 violated the Act, and the United States still
dwarfs other nations in terms of the origin of spam, with
CipherTrust research revealing that an astonishing 56.77% of
all spam comes from U.S.-based IP addresses. While CAN-SPAM
was designed to decrease the overall volume of spam, the exact
opposite has happened: in 2004, spam accounted for
approximately 77% of all email traffic, and phishing attacks
continue to increase exponentially, with studies showing an
increase of 4000% from November 2003 to May 2004
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 Anti Spam Software for the Desktop
The dramatic increase in spam volume has prompted a corresponding
surge in stand-alone anti spam software solutions for the desktop, all
with varying levels of effectiveness. Some anti spam software uses text
filtering to screen incoming messages for known characteristics of spam,
while other solutions rely solely on reputation systems that monitor and
categorize email senders by IP address according to their sending
behavior. Still other anti spam software uses challenge/response filters
to block unapproved mail until the sender responds (manually) to a
challenge email sent to their email account to verify his or her identity.
 With so many different methods of filtering spam, no single software-
based desktop anti spam solution is capable of effectively stopping spam
before it reaches the inbox. The only way to successfully fight spam is to
create an anti spam cocktail including reputation services, text filters,
constant updates and a host of other best-of-breed spam blocking
methods. Just as importantly, an effective anti spam solution should
reside at the email gateway, not at the desktop. Without protection at
the gateway, mail servers waste massive amounts of bandwidth and
storage space processing every message, wanted or not, and end users
face the unenviable task of deciding what to do with the countless spam
messages that successfully reach them.
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 Take a Consolidated Approach to Anti Spam
Although it takes a person only a moment to process a message
and identify it as spam, it is difficult to automate that human
process because no single message characteristic consistently
identifies spam. In fact, there are hundreds of different
message characteristics that may indicate an email is spam, and
an effective anti spam solution must be capable of employing
multiple spam detection techniques.
In addition to effectively identifying spam, businesses must be
assured that legitimate mail is not blocked in error. Even one
false positive, or incorrectly blocked email, can have a
significant impact on businesses today. Accurate spam blocking
requires a combination of tools to examine various message
criteria combined with real-time research and intelligence data.
By aggregating multiple spam detection technologies like text
filtering, reputation services, traffic analysis and other best-of-
breed techniques, and placing the solution at the email gateway
in a hardened appliance, enterprises can retake control of the
inbox
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