summaryrefslogtreecommitdiff
path: root/lisp/mh-e/mh-junk.el
blob: 772faa0aa718672e39504b331bdb065b12a9dfa4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
;;; mh-junk.el --- MH-E interface to anti-spam measures

;; Copyright (C) 2003-2011
;;   Free Software Foundation, Inc.

;; Author: Satyaki Das <satyaki@theforce.stanford.edu>,
;;         Bill Wohler <wohler@newt.com>
;; Maintainer: Bill Wohler <wohler@newt.com>
;; Keywords:  mail, spam

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Spam handling in MH-E.

;;; Change Log:

;;; Code:

(require 'mh-e)
(require 'mh-scan)
(mh-require-cl)

;;;###mh-autoload
(defun mh-junk-blacklist (range)
  "Blacklist RANGE as spam.

This command trains the spam program in use (see the option
`mh-junk-program') with the content of RANGE and then handles the
message(s) as specified by the option `mh-junk-disposition'.

Check the documentation of `mh-interactive-range' to see how RANGE is
read in interactive use.

For more information about using your particular spam fighting
program, see:

  - `mh-spamassassin-blacklist'
  - `mh-bogofilter-blacklist'
  - `mh-spamprobe-blacklist'"
  (interactive (list (mh-interactive-range "Blacklist")))
  (let ((blacklist-func (nth 1 (assoc mh-junk-choice mh-junk-function-alist))))
    (unless blacklist-func
      (error "Customize `mh-junk-program' appropriately"))
    (let ((dest (cond ((null mh-junk-disposition) nil)
                      ((equal mh-junk-disposition "") "+")
                      ((eq (aref mh-junk-disposition 0) ?+)
                       mh-junk-disposition)
                      ((eq (aref mh-junk-disposition 0) ?@)
                       (concat mh-current-folder "/"
                               (substring mh-junk-disposition 1)))
                      (t (concat "+" mh-junk-disposition)))))
      (mh-iterate-on-range msg range
        (message "Blacklisting message %d..." msg)
        (funcall (symbol-function blacklist-func) msg)
        (message "Blacklisting message %d...done" msg)
        (if (not (memq msg mh-seen-list))
            (setq mh-seen-list (cons msg mh-seen-list)))
        (if dest
            (mh-refile-a-msg nil (intern dest))
          (mh-delete-a-msg nil)))
      (mh-next-msg))))

;;;###mh-autoload
(defun mh-junk-whitelist (range)
  "Whitelist RANGE as ham.

This command reclassifies the RANGE as ham if it were incorrectly
classified as spam (see the option `mh-junk-program'). It then
refiles the message into the \"+inbox\" folder.

Check the documentation of `mh-interactive-range' to see how
RANGE is read in interactive use."
  (interactive (list (mh-interactive-range "Whitelist")))
  (let ((whitelist-func (nth 2 (assoc mh-junk-choice mh-junk-function-alist))))
    (unless whitelist-func
      (error "Customize `mh-junk-program' appropriately"))
    (mh-iterate-on-range msg range
      (message "Whitelisting message %d..." msg)
      (funcall (symbol-function whitelist-func) msg)
      (message "Whitelisting message %d...done" msg)
      (mh-refile-a-msg nil (intern mh-inbox)))
    (mh-next-msg)))



;; Spamassassin Interface

(defvar mh-spamassassin-executable (executable-find "spamassassin"))
(defvar mh-sa-learn-executable (executable-find "sa-learn"))

;;;###mh-autoload
(defun mh-spamassassin-blacklist (msg)
  "Blacklist MSG with SpamAssassin.

SpamAssassin is one of the more popular spam filtering programs.
Get it from your local distribution or from the SpamAssassin web
site at URL `http://spamassassin.org/'.

To use SpamAssassin, add the following recipes to
\".procmailrc\":

    PATH=$PATH:/usr/bin/mh
    MAILDIR=$HOME/`mhparam Path`

    # Fight spam with SpamAssassin.
    :0fw
    | spamc

    # Anything with a spam level of 10 or more is junked immediately.
    :0:
    * ^X-Spam-Level: ..........
    /dev/null

    :0:
    * ^X-Spam-Status: Yes
    spam/.

If you don't use \"spamc\", use \"spamassassin -P -a\".

Note that one of the recipes above throws away messages with a
score greater than or equal to 10. Here's how you can determine a
value that works best for you.

First, run \"spamassassin -t\" on every mail message in your
archive and use Gnumeric to verify that the average plus the
standard deviation of good mail is under 5, the SpamAssassin
default for \"spam\".

Using Gnumeric, sort the messages by score and view the messages
with the highest score. Determine the score which encompasses all
of your interesting messages and add a couple of points to be
conservative. Add that many dots to the \"X-Spam-Level:\" header
field above to send messages with that score down the drain.

In the example above, messages with a score of 5-9 are set aside
in the \"+spam\" folder for later review. The major weakness of
rules-based filters is a plethora of false positives so it is
worthwhile to check.

If SpamAssassin classifies a message incorrectly, or is unsure,
you can use the MH-E commands \\[mh-junk-blacklist] and
\\[mh-junk-whitelist].

The command \\[mh-junk-blacklist] adds a \"blacklist_from\" entry
to \"~/spamassassin/user_prefs\", deletes the message, and sends
the message to the Razor, so that others might not see this spam.
If the \"sa-learn\" command is available, the message is also
recategorized as spam.

The command \\[mh-junk-whitelist] adds a \"whitelist_from\" rule
to the \"~/.spamassassin/user_prefs\" file. If the \"sa-learn\"
command is available, the message is also recategorized as ham.

Over time, you'll observe that the same host or domain occurs
repeatedly in the \"blacklist_from\" entries, so you might think
that you could avoid future spam by blacklisting all mail from a
particular domain. The utility function
`mh-spamassassin-identify-spammers' helps you do precisely that.
This function displays a frequency count of the hosts and domains
in the \"blacklist_from\" entries from the last blank line in
\"~/.spamassassin/user_prefs\" to the end of the file. This
information can be used so that you can replace multiple
\"blacklist_from\" entries with a single wildcard entry such as:

    blacklist_from *@*amazingoffersdirect2u.com

In versions of SpamAssassin (2.50 and on) that support a Bayesian
classifier, \\[mh-junk-blacklist] uses the program \"sa-learn\"
to recategorize the message as spam. Neither MH-E, nor
SpamAssassin, rebuilds the database after adding words, so you
will need to run \"sa-learn --rebuild\" periodically. This can be
done by adding the following to your crontab:

    0 * * * *   sa-learn --rebuild > /dev/null 2>&1"
  (unless mh-spamassassin-executable
    (error "Unable to find the spamassassin executable"))
  (let ((current-folder mh-current-folder)
        (msg-file (mh-msg-filename msg mh-current-folder))
        (sender))
    (message "Reporting message %d..." msg)
    (mh-truncate-log-buffer)
    ;; Put call-process output in log buffer if we are saving it
    ;; (this happens if mh-junk-background is t).
    (with-current-buffer mh-log-buffer
      (call-process mh-spamassassin-executable msg-file mh-junk-background nil
                    ;;"--report" "--remove-from-whitelist"
                    "-r" "-R")          ; spamassassin V2.20
    (when mh-sa-learn-executable
      (message "Recategorizing message %d as spam..." msg)
      (mh-truncate-log-buffer)
      (call-process mh-sa-learn-executable msg-file mh-junk-background nil
                    "--single" "--spam" "--local" "--no-rebuild")))
    (message "Blacklisting sender of message %d..." msg)
    (with-current-buffer (get-buffer-create mh-temp-buffer)
      (erase-buffer)
      (call-process (expand-file-name mh-scan-prog mh-progs)
                    nil t nil
                    (format "%d" msg) current-folder
                    "-format" "%<(mymbox{from})%|%(addr{from})%>")
      (goto-char (point-min))
      (if (search-forward-regexp "^\\(.+\\)$" nil t)
          (progn
            (setq sender (match-string 0))
            (mh-spamassassin-add-rule "blacklist_from" sender)
            (message "Blacklisting sender of message %d...done" msg))
        (message "Blacklisting sender of message %d...not done (from my address)" msg)))))

;;;###mh-autoload
(defun mh-spamassassin-whitelist (msg)
  "Whitelist MSG with SpamAssassin.

The \\[mh-junk-whitelist] command adds a \"whitelist_from\" rule to
the \"~/.spamassassin/user_prefs\" file. If the \"sa-learn\" command
is available, the message is also recategorized as ham.

See `mh-spamassassin-blacklist' for more information."
  (unless mh-spamassassin-executable
    (error "Unable to find the spamassassin executable"))
  (let ((msg-file (mh-msg-filename msg mh-current-folder))
        (show-buffer (get-buffer mh-show-buffer))
        from)
    (with-current-buffer (get-buffer-create mh-temp-buffer)
      (erase-buffer)
      (message "Removing spamassassin markup from message %d..." msg)
      (call-process mh-spamassassin-executable msg-file t nil
                    ;; "--remove-markup"
                    "-d")               ; spamassassin V2.20
      (if show-buffer
          (kill-buffer show-buffer))
      (write-file msg-file)
      (when mh-sa-learn-executable
        (message "Recategorizing message %d as ham..." msg)
        (mh-truncate-log-buffer)
        ;; Put call-process output in log buffer if we are saving it
        ;; (this happens if mh-junk-background is t).
        (with-current-buffer mh-log-buffer
          (call-process mh-sa-learn-executable msg-file mh-junk-background nil
                        "--single" "--ham" "--local" "--no-rebuild")))
      (message "Whitelisting sender of message %d..." msg)
      (setq from
            (car (mh-funcall-if-exists
                  ietf-drums-parse-address (mh-get-header-field "From:"))))
      (kill-buffer nil)
      (unless (or (null from) (equal from ""))
        (mh-spamassassin-add-rule "whitelist_from" from))
      (message "Whitelisting sender of message %d...done" msg))))

(defun mh-spamassassin-add-rule (rule body)
  "Add a new rule to \"~/.spamassassin/user_prefs\".
The name of the rule is RULE and its body is BODY."
  (save-window-excursion
    (let* ((line (format "%s\t%s\n" rule body))
           (case-fold-search t)
           (file (expand-file-name "~/.spamassassin/user_prefs"))
           (buffer-exists (find-buffer-visiting file)))
      (find-file file)
      (if (not (search-forward (format "\n%s" line) nil t))
          (progn
            (goto-char (point-max))
            (insert (if (bolp) "" "\n") line)
            (save-buffer)))
      (if (not buffer-exists)
          (kill-buffer nil)))))

;;;###mh-autoload
(defun mh-spamassassin-identify-spammers ()
  "Identify spammers who are repeat offenders.

This function displays a frequency count of the hosts and domains
in the \"blacklist_from\" entries from the last blank line in
\"~/.spamassassin/user_prefs\" to the end of the file. This
information can be used so that you can replace multiple
\"blacklist_from\" entries with a single wildcard entry such as:

    blacklist_from *@*amazingoffersdirect2u.com"
  (interactive)
  (let* ((file (expand-file-name "~/.spamassassin/user_prefs"))
         (domains (make-hash-table :test 'equal)))
    (find-file file)
    ;; Only consider entries between last blank line and end of file.
    (goto-char (1- (point-max)))
    (search-backward-regexp "^$")
    ;; Perform frequency count.
    (save-excursion
      (while (search-forward-regexp "^blacklist_from\\s-*\\(.*\\)@\\(.*\\)$"
                                    nil t)
        (let ((host (match-string 2))
              value)
          ;; Remove top-level-domain from hostname.
          (setq host (cdr (reverse (split-string host "\\."))))
          ;; Add counts for each host and domain part.
          (while host
            (setq value (gethash (car host) domains))
            (setf (gethash (car host) domains) (1+ (if (not value) 0 value)))
            (setq host (cdr host))))))

    ;; Output
    (delete-other-windows)
    (pop-to-buffer (get-buffer-create "*MH-E Spammer Frequencies*"))
    (erase-buffer)
    (maphash '(lambda (key value) ""
                (if (> value 2)
                    (insert (format "%s %s\n" key value))))
             domains)
    (sort-numeric-fields 2 (point-min) (point-max))
    (reverse-region (point-min) (point-max))
    (goto-char (point-min))))



;; Bogofilter Interface

(defvar mh-bogofilter-executable (executable-find "bogofilter"))

;;;###mh-autoload
(defun mh-bogofilter-blacklist (msg)
  "Blacklist MSG with bogofilter.

Bogofilter is a Bayesian spam filtering program. Get it from your
local distribution or from the bogofilter web site at URL
`http://bogofilter.sourceforge.net/'.

Bogofilter is taught by running:

    bogofilter -n < good-message

on every good message, and

    bogofilter -s < spam-message

on every spam message. This is called a full training; three other
training methods are described in the FAQ that is distributed with
bogofilter. Note that most Bayesian filters need 1000 to 5000 of each
type of message to start doing a good job.

To use bogofilter, add the following recipes to \".procmailrc\":

    PATH=$PATH:/usr/bin/mh
    MAILDIR=$HOME/`mhparam Path`

    # Fight spam with bogofilter.
    :0fw
    | bogofilter -3 -e -p

    :0:
    * ^X-Bogosity: Yes, tests=bogofilter
    spam/.

    :0:
    * ^X-Bogosity: Unsure, tests=bogofilter
    spam/unsure/.

If bogofilter classifies a message incorrectly, or is unsure, you can
use the MH-E commands \\[mh-junk-blacklist] and \\[mh-junk-whitelist]
to update bogofilter's training.

The \"Bogofilter FAQ\" suggests that you run the following
occasionally to shrink the database:

    bogoutil -d wordlist.db | bogoutil -l wordlist.db.new
    mv wordlist.db wordlist.db.prv
    mv wordlist.db.new wordlist.db

The \"Bogofilter tuning HOWTO\" describes how you can fine-tune Bogofilter."
  (unless mh-bogofilter-executable
    (error "Unable to find the bogofilter executable"))
  (let ((msg-file (mh-msg-filename msg mh-current-folder)))
    (mh-truncate-log-buffer)
    ;; Put call-process output in log buffer if we are saving it
    ;; (this happens if mh-junk-background is t).
    (with-current-buffer mh-log-buffer
      (call-process mh-bogofilter-executable msg-file mh-junk-background
                    nil "-s"))))

;;;###mh-autoload
(defun mh-bogofilter-whitelist (msg)
  "Whitelist MSG with bogofilter.

See `mh-bogofilter-blacklist' for more information."
  (unless mh-bogofilter-executable
    (error "Unable to find the bogofilter executable"))
  (let ((msg-file (mh-msg-filename msg mh-current-folder)))
    (mh-truncate-log-buffer)
    ;; Put call-process output in log buffer if we are saving it
    ;; (this happens if mh-junk-background is t).
    (with-current-buffer mh-log-buffer
      (call-process mh-bogofilter-executable msg-file mh-junk-background
                    nil "-n"))))



;; Spamprobe Interface

(defvar mh-spamprobe-executable (executable-find "spamprobe"))

;;;###mh-autoload
(defun mh-spamprobe-blacklist (msg)
  "Blacklist MSG with SpamProbe.

SpamProbe is a Bayesian spam filtering program. Get it from your
local distribution or from the SpamProbe web site at URL
`http://spamprobe.sourceforge.net'.

To use SpamProbe, add the following recipes to \".procmailrc\":

    PATH=$PATH:/usr/bin/mh
    MAILDIR=$HOME/`mhparam Path`

    # Fight spam with SpamProbe.
    :0
    SCORE=| spamprobe receive

    :0 wf
    | formail -I \"X-SpamProbe: $SCORE\"

    :0:
    *^X-SpamProbe: SPAM
    spam/.

If SpamProbe classifies a message incorrectly, you can use the
MH-E commands \\[mh-junk-blacklist] and \\[mh-junk-whitelist] to
update SpamProbe's training."
  (unless mh-spamprobe-executable
    (error "Unable to find the spamprobe executable"))
  (let ((msg-file (mh-msg-filename msg mh-current-folder)))
    (mh-truncate-log-buffer)
    ;; Put call-process output in log buffer if we are saving it
    ;; (this happens if mh-junk-background is t).
    (with-current-buffer mh-log-buffer
      (call-process mh-spamprobe-executable msg-file mh-junk-background
                    nil "spam"))))

;;;###mh-autoload
(defun mh-spamprobe-whitelist (msg)
  "Whitelist MSG with SpamProbe.

See `mh-spamprobe-blacklist' for more information."
  (unless mh-spamprobe-executable
    (error "Unable to find the spamprobe executable"))
  (let ((msg-file (mh-msg-filename msg mh-current-folder)))
    (mh-truncate-log-buffer)
    ;; Put call-process output in log buffer if we are saving it
    ;; (this happens if mh-junk-background is t).
    (with-current-buffer mh-log-buffer
      (call-process mh-spamprobe-executable msg-file mh-junk-background
                    nil "good"))))

(provide 'mh-junk)

;; Local Variables:
;; indent-tabs-mode: nil
;; sentence-end-double-space: nil
;; End:

;;; mh-junk.el ends here