Be sure to download our Spam Solutions White Paper...
Complete coverage of the spam problem and how best to get rid of it without
interfering with your regular email delivery.
The Spam Solutions White Paper covers three excellent solutions each in
spam filters, spam blockers, and spam appliances.
Download your copy here:
It's a PDF file, so left click the link above with your mouse and
choose the "Save As" option.
Otherwise, it will open in your browser window.
Get going with your anti-spam solution today.
A spam appliance can function as a spam filter or as
a spam blocker and is intended for businesses with high email
volume. This hardware-based solution applies filtering rules to
incoming mail at the MTA (Message Transfer Agent)
The spam analysis rules are often customizable by the company
Three popular spam appliances are available from:
• Barracuda Networks
• Ironport Systems
• Tumbleweed Communications
Barracuda has a spam appliance called the
Barracuda Spam Firewall that is inexpensive and easy to deploy
for corporate networks.
Highly scalable system
The Barracuda Spam Firewall’s robust and scalable design enables
it to handle email networks of over 10,000 active email users.
It can process over 10 million email messages per day. There are
different models for different mail loads. Multiple Barracuda
systems can be employed and easily configured for redundancy or
additional load capability.
No software to install and no modifications to your existing
Deploying the Barracuda Spam Firewall is easy. Just plug in your
Barracuda Spam Firewall, accept the default settings or make any
changes you’d like and you’re ready to go. There is no software
to install. There are no modifications to your existing system.
It’s that easy. Most customers are up and running in only 5
Independent network device dedicated to spam-blocking
The Barracuda Spam Firewall is a self-sufficient networking
device that handles all your spam-blocking so it does not bog
down your email servers. In fact, with the Barracuda Spam
Firewall, the load on your email system is actually reduced.
Your email servers will process and store less incoming email.
The performance of your email servers will increase.
Blocks spam using proven methods
By using all the best methods to block spam, the Barracuda Spam
Firewall provides comprehensive spam-blocking for your company.
Below are the primary algorithms we employ to block spam:
• Blacklisting of websites & domains: Barracuda Central
maintains an up to date list of the largest and most aggressive
known spammers. This list is maintained by both Barracuda and
other anti-spam groups. This list is automatically updated on
each Barracuda Spam Firewall.
• Keyword scanning of emails: This can be configured on a per
user basis. Our scanning methods include a scoring system such
that emails are scored based on a number of criteria. If the
score is above a threshold, then that email is flagged as spam.
The Barracuda Spam Firewall comes with default criteria and
thresholds but you may change these.
• Checksum technology: Barracuda uses checksum technology to
keep track of the number of times a particular message has
appeared on the Internet. If a message has appeared over a
certain number of times, it is categorized as known spam.
Checksums of known spam messages are utilized to block spam
• Message authenticity checking: Several algorithms are utilized
to verify the authenticity of a message. Some of these are
simple checks to verify that the “from address” is authentic.
Some are more complex relating to SMTP protocol.
• Blacklists and Whitelists: Domains, IP’s, and email addresses
can be blocked or whitelisted (allowed through). These lists may
be maintained on a per user basis or on a corporate basis.
• Rate controls: Utilized to stop denial of service attacks as
well as dictionary based spam attacks. These are integrated and
automatic in the Barracuda Spam Firewall.
• File type attachment blocking: You can block certain types of
files, such as vbl scripts, from entering your company.
User-based and corporate-based filtering
The decision on what types of emails to block can be made either
at the end-user or at various corporate levels. You have the
flexibility to decide where you’d like the decision to be made.
Suspect emails get quarantined
There are three main types of emails: emails that you want,
emails that you do not want (spam), and emails that are suspect.
The Barracuda Spam Firewall can tag suspect emails for delivery
into a separate folder. You can then either have the end user or
another designated person be the final judge of what to do with
these suspect emails. If after 30 days no action is taken, the
message is deleted.
Optional bulk mailboxes for users
Barracuda Spam Firewall provides optional bulk inboxes so that
users can direct spam messages straight into these areas. This
prevents spam from cluttering up their main mail system. These
bulk email boxes can be checked periodically or ignored.
Automatic system updates
A team of engineers monitor the Internet for trends in spam and
virus attacks. As they detect trends, updates are created for
the Barracuda Spam Firewall which then automatically updates
itself without any intervention. Maintaining your Barracuda Spam
Firewall to deliver maximum protection is that easy.
Logs and reports on email statistics
System administrators can view logs or generate reports at any
time from the desktop. It’s quick, easy, hassle-free
No per user charges
Barracuda Spam Firewall pricing is simple. There are three
Barracuda Spam Firewall models. Each one is designed to handle
different active user and email loads. Pricing ranges from $1199
for the smallest model to $3999 for the largest model. There are
no per user charges. Each model comes with both spam-blocking
and virus-checking capabilities.
Multiple domains & servers
A single Barracuda Spam Firewall can also be used for multiple
email servers and for multiple domains.
More information is available at
IronPort Systems makes both high-volume mail
appliances as well as spam appliances. They also own the SpamCop
The IronPort C-Series™ Messaging Gateway™ appliance is built on
IronPort’s revolutionary MTA platform. It enhances security by
preventing suspicious traffic from entering the network. It also
detects spam and viruses and enforces corporate policies.
IronPort has built the C-Series from the ground up to address
the requirements of the modern email gateway and to position
customers for the future of SMTP.
Unique Reputation Filters™ technology identifies suspicious
traffic patterns. Suspect senders are throttled or blocked,
preventing malicious traffic from even entering the network.
The IronPort C-Series includes the world’s fastest content
scanning engine. This flexible engine allows for fine grained
enforcement of corporate policies based on keyword searches of
messages or attachments.
Fully integrated industry leading spam detection powered by
Brightmail® anti-spam. Most accurate spam detection available.
Eliminates the headache of spam without false positives.
Brightmail® is the industry leader in anti-spam technology.
Their technology protects over 280 million mailboxes and 1,400
businesses from the productivity loss and the IT costs of
unsolicited commercial email (spam).
Brightmail on AsyncOS
The IronPort C-Series includes integrated Brightmail
spam-fighting technology. Optimized for IronPort’s AsyncOS™
operating system, Brightmail technology is extremely high
performance and highly accurate. Automatic rule updates are
integrated into the platform requiring zero administrator
Lowest False Positive Rate
False positives cost companies money in lost productivity and
lost opportunities. Brightmail has the lowest false positive
rate in the industry with less than one in one million messages
being a false positive. This accuracy is only achievable by
Brightmail because of the real-time methods they use to identify
spam through their Probe Network™.
Lowest Total Cost of Administration
Brightmail runs the world’s most advanced anti-spam operations
center (BLOC) which delivers the most complete and up to date
set of filters. The BLOC runs 24x7x365 analyzing spam,
generating rules, and ensuring a low false positive rate.
Brightmail writes 30,000 new rules per day so you don’t have to.
Spam Handling Flexibility
Administrators have several choices on how to handle messages
that are flagged as spam by Brightmail. Choices include sending
the message to a per-recipient web quarantine, marking up the
subject header, adding an additional “X-header”, sending the
message to an alternate folder in the user’s mailbox, deleting
or bouncing the message, or a combination of these actions.
The Brightmail system shares information with the IronPort
C-Series Mail Flow Monitor making real-time and historical
reports instantly available at any time.
More information is available at
Tumbleweed's E-mail Firewall for Anti-Spam
provides highly effective spam blocking and management
capabilities, while easing the management burden associated with
fighting the daily deluge of junk mail.
It was recently voted the #1 anti-spam solution by Network World
Developed to provide industrial-strength network protection, for
corporations with over 100 mailboxes, this powerful technology
exceeds the five core requirements for enterprise-level spam
Accurate Spam identification: Keep the "bad" email out,
while letting legitimate email in. The key to minimizing the
risks and costs of spam to the enterprise is successfully
blocking spam while maintaining zero "false-positives."
Easily tailored for your enterprise: Different
organizations define spam in different ways. Tumbleweed
solutions are flexible enough to allow enterprises to easily
create policies based on their unique spam definitions.
Control of anti-spam actions: You can configure your
anti-Spam solution to take different actions depending on the
type and content of the spam detected.
Enterprise-class gateway: Tumbleweed ensures that your
mission-critical email stream remains reliable.
Minimize administrative costs: At the heart of
Tumbleweed’s award winning anti-spam solution is the Dynamic
Anti-spam Service (DAS). DAS automates the process of analyzing
and identifying spam, delivering a highly effective anti-spam
solution with a low total cost of ownership (TCO).
Key Features of the email Firewall for Anti-spam:
• Stops 95% of spam
• Award winning spam analysis engine with auto-updates
• Custom Whitelists (user, group, corporate)
• Custom Blacklists (user, group, corporate)
• Realtime Blackhole Lists
• Flexible actions so each end-user gets what they need
• Reverse DNS Lookup
• Content filtering
• In-depth reporting on email trends, spam volumes, and policy
• High performance SMTP Relay
• Key Benefits
• Email protection and security in one integrated solution
• Save employee time and boost productivity
• Comprehensive network protection
• Protect your intellectual property through flexible and secure
• Enforce communications policies to minimize compliance risks
• Easily integrates with existing email systems (Exchange,
• Easy remote administration and monitoring through a secure
• Flexible policy actions to eliminate false positives
• Low administration with automatic updating of spam heuristics
Available as both Appliance and Software
Tumbleweed’s Email Firewall for Anti-Spam comes as both an
appliance and software.
More information is available at
Net Sense™ Customer Help Center
for network tips, useful info, tools, resources and FAQs!
[ Consulting Articles ] [ Consulting Services ] [ Client Help Center ] [ Code Of Ethics ] [ Code Of Ethics ] [ Consulting Services ] [ Articles ] [ Code Of Ethics ] [ New Pages ]
[ Spam Legal Issues ] [ Spam Appliances ] [ Spam Blockers ] [ Spam Filters ] [ Free Spam Filter ] [ Spam Solutions ] [ Antivirus Best Prac. ] [ Spam Prevention ]
Net Sense © 2004