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Part 1 (Introduction)
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What JSpamFilter does

Introducing JSpamFilter
JSpamfilter is software that intercepts connections from remote Internet mail servers before they can connect to your mail server. JSpamFilter then performs a number of tests to determine the likelihood the incoming message is spam email:
  • The originating IP address for the inbound connection is then checked against one of the DNS-based SPAM Blackhole (DNSBL) lists maintained on the Internet by various organizations.
  • The message content is further analyzed and "scored" on the basis of the occurence of "keywords", "keyphrases" and content tokens.
  • The message is also analyzed in terms of the underlying document structure and the prevalence of script and mark-up tokens.
  • The score is computed using probabalistic and statistical methods.

Upon analysis, the following actions are selectable and
tunable by the System Administrator:

  • If the check passes, the connection is allowed to proceed to your mail server and the message is untouched.
  • If it fails, either

    • the connection is told that the mail server is unavailable, and the message can be outright rejected and refused, or

    • incoming message's Subject line is "tagged" with "[JSpamFilter]"can be "tagged" as having suspicious content for routing at the email client.

    • The message can be accepted, but routed to a "garbage collection" email account.

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