Email Filtering - Email Filter - Spam Filter - Virus Filter

As e-mail passes through the mail routers, our Spam filter automatically scans inbound e-mail and separates out any Spam found.

The Spam filter is a system that we has developed in house. Spam is filtered in a multi-step process. The first step is a collection of millions of “bait” e-mail addresses. These e-mail addresses are used to actively look for Spam. Spam is captured and run through a process in which a fingerprint is created and added to a master database for each message.

Next, as each new customer e-mail message enters the our network, it is fingerprinted and cross-reference in the database to see if there is a match. If there is a match, the message is marked as Spam. If there is no match, the message proceeds to the next step in which it is run through a series of tests where different aspects of the message including the header, subject, and content of the message are analyzed. These tests give the message a score that in turn determines if the message is Spam. Spam messages are fingerprinted and added to the database. Clean messages are queued for delivery to the client. This process, on average, takes less than a second to perform.


Administrators have many options in regards to the filtered Spam:

• SpamTank: With the most popular option being the SpamTank, Spam is held in a user level quarantine on the Global Gateway or the Local Messaging Router. As Spam is identified, temporary junk e-mail boxes are created for each user. Users are notified that they have junk e-mail on the server and are given a link to a web-based control panel where they can check it. The administrator sets the notification interval. Spam is held in this user level quarantine for 30 days before it is deleted.
• Redirection: This option allows administrators to redirect all Spam to a single e-mail address. For example, Spam@yourcompany.com
• X-Header: This option allows administrators to insert an x-header. Rules can be written on the destination mail server to reroute mail via the x-header variable.
• Subject Line Modification: This option allows administrators to modify the subject line of Spam messages. For example, the word JUNK or SPAM could be inserted before the subject so that the individual users could easily identify Spam messages.

Spam Filter Benefits:

• Proprietary filtering process catches 98% of Spam
• .00001% false positive rate
• Automatic filtering with no maintenance headaches
• Reduces the time-distraction of clearing out unwanted e-mail
• Far less expensive than maintaining own onsite spam filtering system
• Implementation in minutes with a simple change in DNS configuration
• Reduced load on IT staff and mail servers

Q): How do you know which messages are spam?
A): Our junk mail filter is a system that we have developed in house. We filter spam in a three-step process.

First we use what we call "bait" e-mail addresses. We have hundreds of e-mail addresses that we use to actively look for spam. We take those spam messages and run them through a process that we've created where we create a fingerprint for each message. Those fingerprints are added to our database.

Secondly, when new e-mail enters our network, we fingerprint each message and cross reference our database to see if there is a match. If there is a match, the message is marked as spam.

If there is no match, we then run the message through a series of test in which we look at different aspects of the message including the header, subject, and content of the message. These tests give the message a score and if that score hits a certain threshold, we mark that message as spam.

This whole process takes less than a second to perform.

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