The Network Box Anti-Spam solution is the most comprehensive and effective gateway Anti-Spam solution in the market today. It provides 25 Anti-Spam engines, combining over a dozen different techniques and is backed by a vast database of Anti-Spam signatures. It provides true defence-in-depth, in a single managed gateway appliance.

The Network Box Anti Spam email gateway achieves an industry-record 97.5% detection rate, with almost zero
false-positives.

Some of the solutions deployed by Network Box are:       

• Co-operative Spam Checksums
  This technique involves breaking apart a message and taking cryptographic checksums of each component of the message. 
• Signatures and Spam Scoring
  Lists of ‘signatures’ which match aspects of spam messages.
• White lists and Black lists
  A list of words / patterns which make a message ‘ham’ (good email) or ‘Spam’.
• Heuristics
  By examining behaviour, tests can be designed to determine if an e-mail is Spam.
• Real-Time IP Blacklists
  Lists of gateways known to be either:
  • known sources of Spam
  • known open-relays (allowing third-party relaying of messages)
  • known dial-up networks
• Real-Time URL Blacklists
  Lists of URLs used by spammers
• URL to IP Mapping and Blacklists
  Lists of IP addresses used by spammers
• Domain Age
  If a domain is very young this can be an indicator of Spam.
• Bayesian Filtering
  Statistical (or Bayesian) filters can be used to automatically maintain word / pattern white lists and blacklists, together with statistical probabilities as to whether the given word / pattern makes the message spam / ham.
• Challenge / Response Systems
  Network Box can challenge previously unknown senders to check they are not spammers.
• Digital Signatures
  This technique is normally used to indicate that an email message is ‘ham’ and is not used to determine spam.
• Optical Character Recognition (OCR)
  Spam sent as pictures can be interpreted as text and hence detected.

Anti-Spam Configuration

The Network Box email system is extremely configurable. Individual engines can be enabled or disabled based on tests, including:

• Direction of the message (inbound or outbound)
• Whether the message is being filtered (eg, POP3, IMAP4)
• Whether the message is redirectable (eg, SMTP)
• Globally (ie, for everything)
• Based on the content of a message headers
• Based on the proxy handling the message (eg, SMTP, POP3)
• Based on a single recipient of the message
• Based on a recipient being one of the recipients of the message
• Based on the sender of the messages
• Based on the sender IP address
• Individual engine parameters can be set to adjust scores and weightings to suit end-user requirements.