Re: [Asrg] Re: 6. Proposals - Standard Headers for Anti-Spam Systems

["Eric S. Raymond" <esr@thyrsus.com>]

Mark E. Mallett <mem@mv.mv.com>:
> I'm interested in the topic, perhaps not to wrangle over it but at
> least to have a standard way of identifying the filter program(s)
> being used.  If there's already something in practical use, or some
> current thinking on the subject, so much the better.  I was thinking
> mostly of a meaningless "filtered-by" sort of label, but you mention a
> score, for which there might be a more structured header or suite of
> headers.  Personally I think that with a variety of ways of marking
> scores (or in fact even having the concept of a "score"), it would be
> hard to specify the a particular structure here.  Plus you might have
> a message passing through multiple filters, each of which would want
> to place its mark on the message without disturbing other such
> marks (so you'd need a tuple of at least {agent, location, assessment}).

Right.  I ran up against this while designing bogofilter.  The syntax you
want is something like this:

* Semicolon-separated fields

* Each field to consist of a agent@hostname:evaluation token

* the evaluation field to consist of comma-separated keyword=value

* The agent field should be versioned, so a real example should look like:

  bogofilter-5.23@thyrsus.com:spam-probability=90%,forged_address=yes;
-- 
		<a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>

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