Re: Getting started with spam filtering

[Niklas Morberg <niklas.morberg@axis.com>]

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Alex Schroeder <alex@emacswiki.org> writes:

> So -- if *you* have a working setup, I would be very happy
> if you could explain it to me, and then I will add it to
> the manual. ;)

Actually, it was quite simple to set up with the new changes
made to spam.el. See attached file for notes I took while
setting it up.

> At the moment, it seems that I can just write that the
> same applies for IMAP, just use nnmail-split-fancy and
> nnimap-split-fancy instead?

That would be just fine.

> I did not understand the cache part, however. Does the
> above work *only* with cached articles, or does the above
> without caching just limit itself to the headers (which
> might also work, of course, or it might not be enough,
> that remains to be seen).

I do the training on the cached articles and since I use
fancy splitting, I guess gnus uses all of the article when
splitting.

Doing the training without having the articles available
locally (via the agent or the cache) seems tricky.

>> 1. Copy this text to the *scratch* buffer
>> 2. edit the strings to reflect your settings
>> 3. go to the end of each statement and press C-x C-e to
>>    evaluate the function
>
> Hm.  Are there other parts of the Gnus manual at this level of detail?

Probably not, no. Maybe it's best to leave it as is.

Btw, it would be nice to be able to check the spam-stat score of
an article. Just as `S t' is bound to `(spam-bogofilter-score)'
I think it should be possible to run `(spam-stat-score-buffer)'
or something similar with a key combination.

Maybe `S t' could be used for that too since you are unlikely
to run multiple spam processors?

Niklas


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Using spam.el and spam-stat.el with an nnimap backend.

I previously had a group called "spam", which is the default
spam group for spam.el. Otherwise I guess you need to create
this.

All my mails start in INBOX, I then split mails with
nnimap-split-fancy to email list groups and to the "spam"
group based on a corporate spam filter. The emails that
are left are put in "incoming".

I did the following changes

in .emacs:

(load "spam")

in gnus.el add this rule to nnimap-split-fancy:
   (: spam-split)

Customize:
 '(spam-use-stat t)
 '(gnus-spam-process-destinations (quote (("incoming" "spam"))))

Train spam-stat:

Start from scratch: (spam-stat-reset)
Reset:(setq spam-stat (make-hash-table :test 'equal))
Learn spam: (spam-stat-process-spam-directory "~/News/agent/nnimap/mailse01.axis.se/spam")
Learn non-spam:
(spam-stat-process-non-spam-directory "~/News/agent/nnimap/mailse01.axis.se/incoming")
(spam-stat-process-non-spam-directory "~/News/agent/nnimap/mailse01.axis.se/INBOX_Archive")
(spam-stat-process-non-spam-directory "~/News/agent/nnimap/mailse01.axis.se/INBOX_Personal")
(spam-stat-process-non-spam-directory "~/News/agent/nnimap/mailse01.axis.se/lists_ding")

Reduce table size: (spam-stat-reduce-size)
Save table: (spam-stat-save)

Then I customized group parameters for the "incoming" group
containing ham mails as such:

 (spam-contents gnus-group-spam-classification-ham)
 (spam-process
  (gnus-group-ham-exit-processor-stat))

and for the spam group:

 (spam-contents gnus-group-spam-classification-spam)
 (spam-process
  (gnus-group-spam-exit-processor-stat))
 (ham-process-destination . "incoming")

and that's it.

When spam end up in ham groups I just press M-d and the
stats are updated when exiting the group.