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Introduction to Innovative Mail Filtering: How to Secure Your E-mail from Spam & Viruses
from Gecad Technologies SA

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Description:
E-mail is not what it was supposed to be. Its inventors have not foreseen the dangers associated with this new form of communication. As a result, most of the mail traffic these days is unwanted: spam, malware, phishing. How can you use AXIGEN and existing free anti-spam, antivirus and anti-phishing software and technologies so that the result is more than the sum of the parts?

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From its very beginnings, AXIGEN has integrated open-source filters such as SpamAssassin and ClamAV and has used the fastest way to process mails through them by interfacing with their daemons directly (spamd and clamd in our case). The downside was that mail messages were scanned in the queue, after having been accepted by the mail server.

In such a scenario, a number of actions are possible based on the results from content filters such as SpamAssassin and ClamAV:

  • Quarantining: used especially for malware, this requires human intervention for double-checking the results and for rescuing false positives from the quarantine when someone notices a malfunction of the filters.
  • Tagging: specific headers are added to messages in order to mark them as unwanted (e.g. SpamAssassin adds X-Spam headers). AXIGEN is capable of filtering such unwanted traffic in a specific sub-folder (typically named “Spam”) which may be inspected for false-positives by the receiver.
  • Bouncing: also known as “backscattering”, a form of collateral spam, because most unwanted mails have forged message envelope senders. Bouncing mails to those envelope senders is the wrong choice, as many of them are innocent persons whose mail addresses have been harvested by spammers.
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