I'd like to see definitions and to-be-determined ("TBD") words
something like these:
TBD1 (address mismatch?): envelope and/or header values that are
inconsistent or apparently contradictory, such as mismatches
between From and Reply-To headers or between envelope Mail_From
domain names and SMTP client IP address reverse DNS names. Some
uses of TBD1 are necessary and desirable.
=consistency filter
forged: envelope or header values involving forgery and that are
fraudulently intended to evade filters or confuse mail recipients.
Header or envelope forgery involves false and fraudulent TBD1.
filter: any mechanism that filters or rejects or discards mail
whether based on IP addresses, envelope values, header absence,
presence or values, words, punctuation, or other patterns in STMP
bodies, STMP authentication mechanims, time of day, or anything
else.
broaden it to anything that categorizes something based on content.
(categorized for deletion is one example)
TBD2 (word filter?): a particular kind of filter that involves
detecting patterns of words or punctuation in message bodies.
=lexigraphical filter (Lexigraphy)(lexicon=dictionary)
TBD3: ("content filter"? perhaps covered by TBD3) a particular sort
of filter that attempts to characterize messages by checksums or
semantic content.
=Statistical content filter
Bayesian filter: any of many mechanisms often unrelated to Bayesian
statistics that involve detecting or count words in the body
and sometimes headers of the message. Bayesian filters are a
special type of TBD2.
TBD4 (address or domain filter?): a particular kind of filter that
detects client IP addresses or domain names. "Blocklist" and
"blacklist" are commonly used for this notion. Many people think
that DNS mechanisms must be involved, but others include local
lists such as the sendmail access_DB.
=network filter
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