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+;;; uce.el --- facilitate reply to unsolicited commercial email
+
+;; Copyright (C) 1996 Free Software Foundation, Inc.
+
+;; Author: stanislav shalunov <shalunov@math.wisc.edu>
+;; Created: 10 Dec 1996
+;; Version: 1.0
+;; Keywords: uce, unsolicited commercial email
+
+;; This file is part of GNU Emacs.
+
+;; This program 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 2, or (at
+;; your option) any later version.
+
+;; This program 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; Code in this file provides semi-automatic means of replying to
+;; UCE's you might get.  It works currently only with Rmail.  If you
+;; would like to make it work with other mail readers, Rmail-specific
+;; section is marked below.  If you want to play with code, would you
+;; please grab the newest version from
+;; http://math.wisc.edu/~shalunov/uce.el and let me know, if you would
+;; like, about your changes so I can incorporate them.  I'd appreciate
+;; it.
+
+;; Function uce-reply-to-uce, if called when current message in RMAIL
+;; buffer is a UCE, will setup *mail* buffer in the following way: it
+;; scans full headers of message for 1) normal return address of
+;; sender (From, Reply-To lines); and puts these addresses into To:
+;; header, it also puts abuse@offenders.host address there 2) mailhub
+;; that first saw this message; and puts address of its postmaster
+;; into To: header 3) finally, it looks at Message-Id and adds
+;; posmaster of that host to the list of addresses.
+
+;; Then, we add "Errors-To: nobody@localhost" header, so that if some
+;; of these addresses are not actually correct, we will never see
+;; bounced mail.  Also, mail-self-blind and mail-archive-file-name
+;; take no effect: the ideology is that we don't want to save junk or
+;; replies to junk.
+
+;; Then we put template into buffer (customizable message that
+;; explains what has happened), customizable signature, and the
+;; original message with full headers and envelope for postmasters.
+;; Then buffer is left for editing.
+
+;; The reason that function uce-reply-to-uce is Rmail dependant is
+;; that we want full headers of the original message, nothing
+;; stripped.  If we use normal means of inserting of the original
+;; message into *mail* buffer headers like Received: (not really
+;; headers, but envelope lines) will be stripped while they bear
+;; valuable for us and postmasters information.  I do wish that there
+;; would be some way to write this function in some portable way, but
+;; I am not aware of any.
+
+;;; Change log:
+
+;; Dec 10, 1996 -- posted draft version to gnu.sources.emacs
+
+;; Dec 11, 1996 -- fixed some typos, and Francesco Potorti`
+;; <F.Potorti@cnuce.cnr.it> pointed out that my use of defvar was
+;; weird, suggested fix, and added let form.
+
+;; Dec 17, 1996 -- made scanning for host names little bit more clever
+;; (obviously bogus stuff like localhost is now ignored).
+
+;;; Setup:
+
+;; put in your ~./emacs the following line:
+
+;; (autoload 'uce-reply-to-uce "uce" "Reply to UCEs" t nil)
+
+;; store this file (uce.el) somewhere in load-path and byte-compile it.
+
+;;; Variables:
+
+;; uce-message-text is template that will be inserted into buffer.  It
+;; has reasonable default.  If you want to write some scarier one,
+;; please do so and send it to me.  Please keep it polite.
+
+;; uce-signature behaves just like mail-signature.  If nil, nothing is
+;; inserted, if t, file ~/.signature is used, if a string, its
+;; contents are inserted into buffer.
+
+;; uce-uce-separator is line that separates your message from the UCE
+;; that you enclose.
+
+;; uce-subject-line will be used as subject of outgoing message.  If
+;; nil, left blank.
+
+;;; Code:
+
+(require 'sendmail)
+(require 'rmail)
+
+(defvar uce-setup-hook nil
+  "Hook to run after UCE rant message is composed.
+This hook is run after mail-setup-hook, which is run as well.")
+
+(defvar uce-message-text 
+  "Recently, I have received an Unsolicited Commercial E-mail from you.
+I do not like UCE's and I would like to inform you that sending
+unsolicited messages to someone while he or she may have to pay for
+reading your message may be illegal.  Anyway, it is highly annoying
+and not welcome by anyone.  It is rude, after all.
+
+If you think that this is a good way to advertise your products or
+services you are mistaken.  Spamming will only make people hate you, not
+buy from you.
+
+If you have any list of people you send unsolicited commercial emails to, 
+REMOVE me from such list immediately.  I suggest that you make this list 
+just empty.
+
+Note to the postmaster(s): I append the text of UCE in question to
+this message, I would like to hear from you about action(s) taken.
+This message has been sent to postmasters at the host that is
+mentioned as original sender's host and to the postmaster whose host
+was used as mail relay for this message.  If message was sent not by
+your user, could you please compare time when this message was sent
+(use time in Received: field of the envelope rather than Date: field)
+with your sendmail logs and see what host was using your sendmail at
+this moment of time.
+
+Thank you."
+
+  "This is the text that uce-reply-to-uce command will put in reply buffer.
+Some of spamming programs in use will be set up to read all incoming
+to spam address email, and will remove people who put the word `remove'
+on beginning of some line from the spamming list.  So, when you set it
+up, it might be a good idea to actually use this feature.
+
+Value nil means insert no text by default, lets you type it in.")
+
+(defvar uce-uce-separator
+  "----- original unsolicited commercial email follows -----"
+  "Line that will begin quoting of the UCE.
+Value nil means use no separator.")
+
+(defvar uce-signature mail-signature
+"Text to put as your signature after the note to UCE sender.  
+Value nil means none, t means insert ~/.signature file (if it happens
+to exist), if this variable is a string this string will be inserted
+as your signature.")
+
+(defvar uce-default-headers
+  "Errors-To: nobody@localhost\nPrecedence: bulk\n"
+  "Additional headers to use when responding to a UCE with \\[uce-reply-to-uce].
+These are mostly meant for headers that prevent delivery errors reporting.")
+
+(defvar uce-subject-line
+  "Spam alert: unsolicited commercial e-mail"
+  "Subject of the message that will be sent in response to a UCE.")
+
+(defun uce-reply-to-uce (&optional ignored)
+  "Send reply to UCE in Rmail.
+UCE stands for unsolicited commercial email.  Function will set up reply
+buffer with default To: to the sender, his postmaster, his abuse@
+address, and postmaster of the mail relay used."
+  (interactive "P")
+  (let ((to (mail-strip-quoted-names (mail-fetch-field "from" t)))
+	(reply-to (mail-fetch-field "reply-to"))
+	temp)
+    ;; Initial setting of the list of recipients of our message; that's
+    ;; what they are pretending to be (and in many cases, really are).
+    (if to
+	(setq to (format "%s" (mail-strip-quoted-names to)))
+      (setq to ""))
+    (if reply-to
+	(setq to (format "%s, %s" to (mail-strip-quoted-names reply-to))))
+    (let (first-at-sign end-of-hostname sender-host)
+      (setq first-at-sign (string-match "@" to)
+	    end-of-hostname (string-match "[ ,>]" to first-at-sign)
+	    sender-host (substring to first-at-sign end-of-hostname))
+      (if (string-match "\\." sender-host)
+          (setq to (format "%s, postmaster%s, abuse%s" 
+                           to sender-host sender-host))))
+    (setq mail-send-actions nil)
+    (setq mail-reply-buffer nil)
+    ;; Begin of Rmail dependant section.
+    (or (get-buffer "RMAIL")
+	(error "No buffer RMAIL, cannot find UCE"))
+    (switch-to-buffer "RMAIL")
+    (save-excursion
+      (save-restriction
+	(widen)
+	(rmail-maybe-set-message-counters)
+	(copy-region-as-kill (rmail-msgbeg rmail-current-message) 
+			     (rmail-msgend rmail-current-message))))
+    (switch-to-buffer "*mail*")
+    (erase-buffer)
+    (setq temp (point))
+    (yank)
+    (goto-char temp)
+    (forward-line 2)
+    (while (looking-at "Summary-Line:\\|Mail-From:")
+      (forward-line 1))
+    (delete-region temp (point))
+    ;; Now find the mail hub that first accepted this message.
+    (while (or (looking-at "Received:")
+               (looking-at " ")
+               (looking-at "\t"))
+      (forward-line 1))
+    (while (or (looking-at " ")
+               (looking-at "\t"))
+      (forward-line -1))
+    ;; Is this always good?  It's the only thing I saw when I checked
+    ;; a few messages.
+    (search-forward ": from ")
+    (setq temp (point))
+    (search-forward " ")
+    (forward-char -1)
+    ;; And add its postmaster to the list of addresses.
+    (if (string-match "\\." (buffer-substring temp (point)))
+        (setq to (format "%s, postmaster@%s" 
+                         to (buffer-substring temp (point)))))
+    ;; Also look at the message-id, it helps *very* often.
+    (search-forward "\nMessage-Id: ")
+    (search-forward "@")
+    (setq temp (point))
+    (search-forward ">")
+    (forward-char -1)
+    (if (string-match "\\." (buffer-substring temp (point)))
+        (setq to (format "%s, postmaster@%s" 
+                         to (buffer-substring temp (point)))))
+    (search-forward "\n*** EOOH ***\n")
+    (forward-line -1)
+    (setq temp (point))
+    (search-forward "\n\n" nil t)
+    (delete-region temp (point))
+    ;; End of Rmail dependent section.
+    (auto-save-mode auto-save-default)
+    (mail-mode)
+    (goto-char (point-min))
+    (insert "To: ")
+    (save-excursion
+      (if to
+	  (let ((fill-prefix "\t")
+		(address-start (point)))
+	    (insert to "\n")
+	    (fill-region-as-paragraph address-start (point)))
+	(newline))
+      (insert "Subject: " uce-subject-line "\n")
+      (if uce-default-headers
+	  (insert uce-default-headers))
+      (if mail-default-headers
+          (insert mail-default-headers))
+      (if mail-default-reply-to
+	  (insert "Reply-to: " mail-default-reply-to "\n"))
+      (insert mail-header-separator "\n")
+      ;; Insert all our text.  Then go back to the place where we started.
+      (if to (setq to (point)))
+      ;; Text of ranting.
+      (if uce-message-text
+	  (insert uce-message-text))
+      ;; Signature.
+      (cond ((eq uce-signature t)
+	     (if (file-exists-p "~/.signature")
+		 (progn
+		   (insert "\n\n-- \n")
+		   (insert-file "~/.signature")
+		   ;; Function insert-file leaves point where it was,
+		   ;; while we want to place signature in the ``middle''
+		   ;; of the message.
+		   (exchange-point-and-mark))))
+	    (uce-signature
+	     (insert "\n\n-- \n" uce-signature)))
+      ;; And text of the original message.
+      (if uce-uce-separator
+	  (insert "\n\n" uce-uce-separator "\n"))
+      ;; If message doesn't end with a newline, insert it.
+      (goto-char (point-max))
+      (or (bolp) (newline)))
+    ;; And go back to the beginning of text.
+    (if to (goto-char to))
+    (or to (set-buffer-modified-p nil))
+    ;; Run hooks before we leave buffer for editing.  Reasonable usage
+    ;; might be to set up special key bindings, replace standart
+    ;; functions in mail-mode, etc.
+    (run-hooks 'mail-setup-hook 'uce-setup-hook)))
+  
+(defun uce-insert-ranting (&optional ignored)
+  "Insert text of the usual reply to UCE into current buffer."
+  (interactive "P")
+  (insert uce-message-text))
+
+(provide 'uce)
+
+;;; uce.el ends here