1 ;;; pop3.el --- Post Office Protocol (RFC 1460) interface
3 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002
4 ;; Free Software Foundation, Inc.
6 ;; Author: Richard L. Pieri <ratinox@peorth.gweep.net>
7 ;; Daiki Ueno <ueno@ueda.info.waseda.ac.jp>
8 ;; Katsumi Yamaoka <yamaoka@jpl.org>
9 ;; Maintainer: Volunteers
12 ;; This file is part of T-gnus.
14 ;; GNU Emacs is free software; you can redistribute it and/or modify
15 ;; it under the terms of the GNU General Public License as published by
16 ;; the Free Software Foundation; either version 2, or (at your option)
19 ;; GNU Emacs is distributed in the hope that it will be useful,
20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 ;; GNU General Public License for more details.
24 ;; You should have received a copy of the GNU General Public License
25 ;; along with GNU Emacs; see the file COPYING. If not, write to the
26 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
27 ;; Boston, MA 02111-1307, USA.
31 ;; Most of the standard Post Office Protocol version 3 (RFC 1460) commands
32 ;; are implemented. The LIST command has not been implemented due to lack
33 ;; of actual usefulness.
34 ;; The optional POP3 command TOP has not been implemented.
36 ;; This program was inspired by Kyle E. Jones's vm-pop program.
38 ;; You have to set the variable `pop3-connection-type' to `ssl' or
39 ;; `tls' expressly, if you would like to use this module with Gnus
40 ;; (not T-gnus) for those connection types. For examples:
42 ;;(setq mail-sources '((pop :server "POPSERVER" :port 995 :connection ssl
43 ;; :authentication apop)))
44 ;;(setq pop3-connection-type 'ssl)
48 (eval-when-compile (require 'cl))
50 ;; as-binary-process, open-network-stream-as-binary, write-region-as-binary
57 (defvar pop3-maildrop (or (user-login-name) (getenv "LOGNAME") (getenv "USER") nil)
59 (defvar pop3-mailhost (or (getenv "MAILHOST") nil)
63 (defvar pop3-connection-type nil
64 "*POP3 connection type.")
66 (defvar pop3-password-required t
67 "*Non-nil if a password is required when connecting to POP server.")
68 (defvar pop3-password nil
69 "*Password to use when connecting to POP server.")
71 (defvar pop3-authentication-scheme 'pass
72 "*POP3 authentication scheme.
73 Defaults to 'pass, for the standard USER/PASS authentication. Other valid
76 (defvar pop3-timestamp nil
77 "Timestamp returned when initially connected to the POP server.
78 Used for APOP authentication.")
80 (defvar pop3-leave-mail-on-server nil
81 "Non-nil if mail is to be left on the server and UIDL used for message retrieval.")
83 (defvar pop3-maximum-message-size nil
84 "If non-nil only download messages smaller than this.")
86 (defvar pop3-except-header-regexp nil
87 "If non-nil we do not retrieve messages whose headers are matching this regexp.")
89 (defvar pop3-uidl-file-name "~/.uidls"
90 "File in which to store the UIDL of processed messages.")
92 (defvar pop3-uidl-support 'dont-know
93 "Whether the server supports UIDL.
94 Nil means no, t means yes, not-nil-or-t means yet to be determined.")
96 (defvar pop3-uidl-obarray (make-vector 31 0)
99 (defvar pop3-read-point nil)
100 (defvar pop3-debug nil)
103 (autoload 'open-ssl-stream "ssl")
104 (autoload 'starttls-open-stream "starttls")
105 (autoload 'starttls-negotiate "starttls"))
107 (defvar pop3-ssl-program-name
108 (if (exec-installed-p "openssl")
111 "The program to run in a subprocess to open an SSL connection.")
113 (defvar pop3-ssl-program-arguments
114 '("s_client" "-quiet")
115 "Arguments to be passed to the program `pop3-ssl-program-name'.")
117 (defun pop3-progress-message (format percent &rest args)
118 (apply (function message) format args))
120 (defun pop3-movemail (&optional crashbox)
121 "Transfer contents of a maildrop to the specified CRASHBOX."
122 (or crashbox (setq crashbox (expand-file-name "~/.crashbox")))
123 (let* ((process (pop3-open-server pop3-mailhost pop3-port))
124 (crashbuf (get-buffer-create " *pop3-retr*"))
127 (pop3-password pop3-password)
128 (pop3-uidl-file-name (convert-standard-filename
129 (concat pop3-uidl-file-name "-"
131 retrieved-messages messages)
132 ;; for debugging only
133 (if pop3-debug (switch-to-buffer (process-buffer process)))
134 ;; query for password
135 (if (and pop3-password-required (not pop3-password))
137 (pop3-read-passwd (format "Password for %s: " pop3-maildrop))))
138 (cond ((equal 'apop pop3-authentication-scheme)
139 (pop3-apop process pop3-maildrop))
140 ((equal 'pass pop3-authentication-scheme)
141 (pop3-user process pop3-maildrop)
143 (t (error "Invalid POP3 authentication scheme")))
144 ;; get messages that are suitable for download
145 (message "Retrieving message list...")
146 (setq messages (pop3-get-message-numbers process)
147 message-count (length (cdr messages)))
148 (message "Retrieving message list...%d of %d unread"
149 message-count (pop messages))
151 (unless (not (stringp crashbox))
153 (pop3-progress-message
154 "Retrieving message %d of %d (%d octets) from %s..."
155 (floor (* (/ (float n) message-count) 100))
156 n message-count (cdar messages) pop3-mailhost)
157 (pop3-retr process (caar messages) crashbuf)
158 (push (caar messages) retrieved-messages)
159 (setq messages (cdr messages)
161 (with-current-buffer crashbuf
162 (write-region-as-binary (point-min) (point-max)
163 crashbox 'append 'nomesg))
164 ;; mark messages as read
165 (when pop3-leave-mail-on-server
167 ;; now delete the messages we have retrieved
168 (unless pop3-leave-mail-on-server
169 (dolist (n retrieved-messages)
170 (message "Deleting message %d of %d from %s..."
171 n message-count pop3-mailhost)
172 (pop3-dele process n)))
175 (kill-buffer crashbuf)
178 (defun pop3-get-message-count ()
179 "Return the number of messages in the maildrop."
180 (let* ((process (pop3-open-server pop3-mailhost pop3-port))
182 (pop3-password pop3-password)
184 ;; for debugging only
185 (if pop3-debug (switch-to-buffer (process-buffer process)))
186 ;; query for password
187 (if (and pop3-password-required (not pop3-password))
189 (pop3-read-passwd (format "Password for %s: " pop3-maildrop))))
190 (cond ((equal 'apop pop3-authentication-scheme)
191 (pop3-apop process pop3-maildrop))
192 ((equal 'pass pop3-authentication-scheme)
193 (pop3-user process pop3-maildrop)
195 (t (error "Invalid POP3 authentication scheme")))
196 (setq message-count (car (pop3-stat process)))
200 (defun pop3-open-server (mailhost port)
201 "Open TCP connection to MAILHOST on PORT.
202 Returns the process associated with the connection.
203 Argument PORT specifies connecting port."
206 (set-buffer (get-buffer-create (concat " trace of POP session to "
209 (setq pop3-read-point (point-min))
213 ((eq pop3-connection-type 'ssl)
214 (pop3-open-ssl-stream "POP" (current-buffer) mailhost port))
215 ((eq pop3-connection-type 'tls)
216 (pop3-open-tls-stream "POP" (current-buffer) mailhost port))
218 (open-network-stream-as-binary "POP" (current-buffer)
220 (let ((response (pop3-read-response process t)))
222 (substring response (or (string-match "<" response) 0)
223 (+ 1 (or (string-match ">" response) -1)))))
226 (defun pop3-open-ssl-stream-1 (name buffer host service extra-arg)
227 (let* ((ssl-program-name
228 pop3-ssl-program-name)
229 (ssl-program-arguments
230 `(,@pop3-ssl-program-arguments
232 "-connect" ,(format "%s:%d" host service)))
233 (process (open-ssl-stream name buffer host service)))
235 (with-current-buffer buffer
236 (goto-char (point-min))
237 (while (and (memq (process-status process) '(open run))
238 (goto-char (point-max))
240 (not (looking-at "+OK")))
241 (accept-process-output process 1)
243 (delete-region (point-min) (point)))
244 (and process (memq (process-status process) '(open run))
247 (defun pop3-open-ssl-stream (name buffer host service)
248 "Open a SSL connection for a service to a host.
249 Returns a subprocess-object to represent the connection.
250 Args are NAME BUFFER HOST SERVICE."
251 (cond ((eq system-type 'windows-nt)
252 (let (selective-display
253 (coding-system-for-write 'binary)
254 (coding-system-for-read 'raw-text-dos))
255 (or (pop3-open-ssl-stream-1 name buffer host service "-ssl3")
256 (pop3-open-ssl-stream-1 name buffer host service "-ssl2"))))
259 (or (pop3-open-ssl-stream-1 name buffer host service "-ssl3")
260 (pop3-open-ssl-stream-1 name buffer host service "-ssl2"))))))
262 (defun pop3-open-tls-stream (name buffer host service)
263 "Open a TLSv1 connection for a service to a host.
264 Returns a subprocess-object to represent the connection.
265 Args are NAME BUFFER HOST SERVICE."
267 (as-binary-process (starttls-open-stream
268 name buffer host service))))
270 (starttls-negotiate process)
275 (defun pop3-process-filter (process output)
277 (set-buffer (process-buffer process))
278 (goto-char (point-max))
281 (defun pop3-send-command (process command)
282 (set-buffer (process-buffer process))
283 (goto-char (point-max))
284 ;; (if (= (aref command 0) ?P)
285 ;; (insert "PASS <omitted>\r\n")
286 ;; (insert command "\r\n"))
287 (setq pop3-read-point (point))
288 (goto-char (point-max))
289 (process-send-string process (concat command "\r\n"))
292 (defun pop3-read-response (process &optional return)
293 "Read the response from the server PROCESS.
294 Return the response string if optional second argument RETURN is non-nil."
295 (let ((case-fold-search nil)
298 (set-buffer (process-buffer process))
299 (goto-char pop3-read-point)
300 (while (not (search-forward "\r\n" nil t))
301 (accept-process-output process 3)
302 (goto-char pop3-read-point))
303 (setq match-end (point))
304 (goto-char pop3-read-point)
305 (if (looking-at "-ERR")
306 (error (buffer-substring (point) (- match-end 2)))
307 (if (not (looking-at "+OK"))
308 (progn (setq pop3-read-point match-end) nil)
309 (setq pop3-read-point match-end)
311 (buffer-substring (point) match-end)
315 (defvar pop3-read-passwd nil)
316 (defun pop3-read-passwd (prompt)
317 (if (not pop3-read-passwd)
318 (if (fboundp 'read-passwd)
319 (setq pop3-read-passwd 'read-passwd)
320 (if (load "passwd" t)
321 (setq pop3-read-passwd 'read-passwd)
322 (autoload 'ange-ftp-read-passwd "ange-ftp")
323 (setq pop3-read-passwd 'ange-ftp-read-passwd))))
324 (funcall pop3-read-passwd prompt))
326 (defun pop3-clean-region (start end)
327 (setq end (set-marker (make-marker) end))
330 (while (and (< (point) end) (search-forward "\r\n" end t))
331 (replace-match "\n" t t))
333 (while (re-search-forward "\n\n\\(From \\)" end t)
334 (replace-match "\n\n>\\1" t nil))
336 (while (and (< (point) end) (re-search-forward "^\\." end t))
337 (replace-match "" t t)
339 (set-marker end nil))
341 (eval-when-compile (defvar parse-time-months))
343 ;; Copied from message-make-date.
344 (defun pop3-make-date (&optional now)
345 "Make a valid date header.
346 If NOW, use that time instead."
347 (require 'parse-time)
348 (let* ((now (or now (current-time)))
349 (zone (nth 8 (decode-time now)))
353 (setq zone (- zone)))
355 (format-time-string "%d" now)
356 ;; The month name of the %b spec is locale-specific. Pfff.
358 (capitalize (car (rassoc (nth 4 (decode-time now))
359 parse-time-months))))
360 (format-time-string "%Y %H:%M:%S " now)
361 ;; We do all of this because XEmacs doesn't have the %z spec.
362 (format "%s%02d%02d" sign (/ zone 3600) (/ (% zone 3600) 60)))))
364 (defun pop3-munge-message-separator (start end)
365 "Check to see if a message separator exists. If not, generate one."
368 (narrow-to-region start end)
369 (goto-char (point-min))
370 (if (not (or (looking-at "From .?") ; Unix mail
371 (looking-at "\001\001\001\001\n") ; MMDF
372 (looking-at "BABYL OPTIONS:") ; Babyl
374 (let* ((from (mail-strip-quoted-names (mail-fetch-field "From")))
375 (tdate (mail-fetch-field "Date"))
376 (date (split-string (or (and tdate
377 (not (string= "" tdate))
382 ;; sample date formats I have seen
383 ;; Date: Tue, 9 Jul 1996 09:04:21 -0400 (EDT)
384 ;; Date: 08 Jul 1996 23:22:24 -0400
386 ;; Tue Jul 9 09:04:21 1996
389 "Tue Jan 1 00:00:0 1900")
390 ((string-match "[A-Z]" (nth 0 date))
391 (format "%s %s %s %s %s"
392 (nth 0 date) (nth 2 date) (nth 1 date)
393 (nth 4 date) (nth 3 date)))
395 ;; this really needs to be better but I don't feel
396 ;; like writing a date to day converter.
397 (format "Sun %s %s %s %s"
398 (nth 1 date) (nth 0 date)
399 (nth 3 date) (nth 2 date)))
401 (setq From_ (format "\nFrom %s %s\n" from date))
402 (while (string-match "," From_)
403 (setq From_ (concat (substring From_ 0 (match-beginning 0))
404 (substring From_ (match-end 0)))))
405 (goto-char (point-min))
407 (if (search-forward "\n\n" nil t)
409 (goto-char (point-max))
411 (narrow-to-region (point) (point-max))
412 (let ((size (- (point-max) (point-min))))
413 (goto-char (point-min))
416 (insert (format "Content-Length: %s\n" size)))
421 (defun pop3-get-message-numbers (process)
422 "Get the list of message numbers and lengths to retrieve via PROCESS."
423 ;; we use the LIST comand first anyway to get the message lengths.
424 ;; then if we're leaving mail on the server, see if the UIDL command
425 ;; is implemented. if so, we use it to get the message number list.
426 (let* ((messages (pop3-list process))
427 (total (or (pop messages) 0))
428 (uidl (if pop3-leave-mail-on-server
429 (pop3-get-uidl process)))
432 ;; only retrieve messages matching our regexp or in the uidl list
434 ;; remove elements not in the uidl, this assumes the uidl is short
435 (or (not (eq pop3-uidl-support t))
436 (memq (caar messages) uidl))
438 ;; don't download messages that are too large
439 (not (and pop3-maximum-message-size
440 (> (cdar messages) pop3-maximum-message-size)))
441 (not (and pop3-except-header-regexp
442 (string-match pop3-except-header-regexp
443 (pop3-top process (caar messages) 0)))))
444 (push (car messages) out))
445 (setq messages (cdr messages)))
446 (cons total (reverse out))))
448 (defun pop3-get-uidl (process)
449 "Use PROCESS to get a list of unread message numbers."
450 (let ((messages (pop3-uidl process)) uidl)
451 (if (or (null messages) (null pop3-uidl-support))
452 (setq pop3-uidl-support nil)
453 (setq pop3-uidl-support t)
456 (when (file-readable-p pop3-uidl-file-name)
457 (insert-file-contents pop3-uidl-file-name))
458 (goto-char (point-min))
459 (while (looking-at "\\([^ \n\t]+\\)")
460 (set (intern (match-string 1) pop3-uidl-obarray)
464 (dolist (message (cdr messages))
465 (if (setq uidl (intern-soft (cdr message) pop3-uidl-obarray))
466 (setcar (symbol-value uidl) (car message))
467 (set (intern (cdr message) pop3-uidl-obarray)
468 (cons (car message) nil))))
469 (pop3-get-unread-message-numbers))
472 (defun pop3-get-unread-message-numbers ()
473 "Return a sorted list of unread msg numbers to retrieve."
475 (mapatoms (lambda (atom)
476 (if (not (cdr (symbol-value atom)))
477 (push (car (symbol-value atom)) nums)))
481 (defun pop3-save-uidls ()
482 "Save the updated UIDLs to disk for use next time."
483 (when (and pop3-leave-mail-on-server
484 ;; UIDL hash table is non-empty
485 (let ((len (length pop3-uidl-obarray)))
487 (setq len (if (symbolp (aref pop3-uidl-obarray (1- len)))
490 (when (file-readable-p pop3-uidl-file-name)
491 (copy-file pop3-uidl-file-name
492 (concat pop3-uidl-file-name ".old")
493 'overwrite 'keeptime))
495 (with-temp-file pop3-uidl-file-name
498 (when (car (symbol-value atom))
499 (insert (format "%s\n" atom))))
501 (fillarray pop3-uidl-obarray 0)))
506 ;; AUTHORIZATION STATE
508 (defun pop3-user (process user)
509 "Send USER information to POP3 server."
510 (pop3-send-command process (format "USER %s" user))
511 (let ((response (pop3-read-response process t)))
512 (if (not (and response (string-match "+OK" response)))
513 (error (format "USER %s not valid" user)))))
515 (defun pop3-pass (process)
516 "Send authentication information to the server."
517 (pop3-send-command process (format "PASS %s" pop3-password))
518 (let ((response (pop3-read-response process t)))
519 (if (not (and response (string-match "+OK" response)))
520 (pop3-quit process))))
522 ;; When this file is being compiled in the Gnus (not T-gnus) source
523 ;; tree, `md5' might have been defined in w3/md5.el, ./lpath.el or one
524 ;; of some other libraries and `md5' will accept only 3 arguments. We
525 ;; will deceive the byte-compiler not to say warnings.
527 (if (fboundp 'eval-when)
528 ;; `eval-when' might not be provided when loading .el file.
530 (let ((def (assq 'md5 byte-compile-function-environment)))
532 (setcdr def '(lambda (object &optional start end
533 coding-system noerror)))
534 (setq byte-compile-function-environment
535 (cons '(md5 . (lambda (object &optional start end
536 coding-system noerror)))
537 byte-compile-function-environment)))))))
539 ;; Note that `pop3-md5' should never encode a given string to use for
540 ;; the apop authentication.
543 (if (condition-case nil
545 Check whether the 4th argument CODING-SYSTEM is allowed"
548 ;; Emacs 21 or XEmacs 21
549 ;; (md5 OBJECT &optional START END CODING-SYSTEM NOERROR)
550 (defun pop3-md5 (string)
551 (md5 string nil nil 'binary))
552 ;; The reason why the program reaches here:
553 ;; 1. XEmacs 20 is running and the built-in `md5' doesn't
554 ;; allow the 4th argument.
555 ;; 2. `md5' has been defined by one of some lisp libraries.
556 ;; 3. This file is being compiled in the Gnus source tree,
557 ;; and `md5' has been defined in lpath.el.
558 (defalias 'pop3-md5 'md5))
559 ;; The lisp function will be provided by FLIM or other libraries.
560 (autoload 'md5 "md5")
561 (defalias 'pop3-md5 'md5)))
563 (defun pop3-apop (process user)
564 "Send alternate authentication information to the server."
565 (let ((pass pop3-password))
566 (if (and pop3-password-required (not pass))
568 (pop3-read-passwd (format "Password for %s: " pop3-maildrop))))
570 (let ((hash (pop3-md5 (concat pop3-timestamp pass))))
571 (pop3-send-command process (format "APOP %s %s" user hash))
572 (let ((response (pop3-read-response process t)))
573 (if (not (and response (string-match "+OK" response)))
574 (pop3-quit process)))))
577 (defun pop3-stls (process)
578 "Query whether TLS extension is supported"
579 (pop3-send-command process "STLS")
580 (let ((response (pop3-read-response process t)))
581 (if (not (and response (string-match "+OK" response)))
582 (pop3-quit process))))
586 (defun pop3-stat (process)
587 "Return the number of messages in the maildrop and the maildrop's size."
588 (pop3-send-command process "STAT")
589 (let ((response (pop3-read-response process t)))
590 (list (string-to-int (nth 1 (split-string response " ")))
591 (string-to-int (nth 2 (split-string response " "))))
594 (defun pop3-retr (process msg crashbuf)
595 "Retrieve message-id MSG to buffer CRASHBUF."
596 (pop3-send-command process (format "RETR %s" msg))
597 (pop3-read-response process)
599 (let ((region (pop3-get-extended-response process)))
600 (pop3-munge-message-separator (car region) (cadr region))
601 (append-to-buffer crashbuf (car region) (cadr region))
602 (delete-region (car region) (cadr region))
605 (defun pop3-dele (process msg)
606 "Mark message-id MSG as deleted."
607 (pop3-send-command process (format "DELE %s" msg))
608 (pop3-read-response process))
610 (defun pop3-noop (process msg)
612 (pop3-send-command process "NOOP")
613 (pop3-read-response process))
615 (defun pop3-last (process)
616 "Return highest accessed message-id number for the session."
617 (pop3-send-command process "LAST")
618 (let ((response (pop3-read-response process t)))
619 (string-to-int (nth 1 (split-string response " ")))
622 (defun pop3-rset (process)
623 "Remove all delete marks from current maildrop."
624 (pop3-send-command process "RSET")
625 (pop3-read-response process))
629 (defun pop3-quit (process)
630 "Close connection to POP3 server.
631 Tell server to remove all messages marked as deleted, unlock the maildrop,
632 and close the connection."
633 (pop3-send-command process "QUIT")
634 (pop3-read-response process t)
637 (set-buffer (process-buffer process))
638 (goto-char (point-max))
639 (delete-process process))))
641 (defun pop3-uidl (process &optional msgno)
642 "Return the results of a UIDL command in PROCESS for optional MSGNO.
643 If UIDL is unsupported on this mail server or if msgno is invalid, return nil.
644 Otherwise, return a list in the form
646 (N (1 UIDL-1) (2 UIDL-2) ... (N UIDL-N))
650 N is an integer for the number of UIDLs returned (could be 0)
654 (pop3-send-command process (format "UIDL %d" msgno))
655 (pop3-send-command process "UIDL"))
657 (if (null (pop3-read-response process t))
658 nil ;; UIDL is not supported on this server
662 (apply 'narrow-to-region (pop3-get-extended-response process))
663 (goto-char (point-min))
664 (while (looking-at "\\([^ \n\t]*\\) \\([^ \n\t]*\\)")
665 (setq msgno (string-to-int (match-string 1))
666 uidl (match-string 2))
667 (push (cons msgno uidl) pairs)
668 (beginning-of-line 2))
669 (cons (length pairs) (nreverse pairs))
672 (defun pop3-list (process &optional msgno)
673 "Return the results of a LIST command for PROCESS and optional MSGNO.
674 If (optional) msgno is invalid, return nil. Otherwise, return a list
677 (N (1 LEN-1) (2 LEN-2) ... (N LEN-N))
681 N is an integer for the number of msg/len pairs (could be 0)
682 LEN-n is an integer."
684 (pop3-send-command process (format "LIST %d" msgno))
685 (pop3-send-command process "LIST"))
687 (if (null (pop3-read-response process t))
688 nil ;; MSGNO is not valid number
692 (apply 'narrow-to-region (pop3-get-extended-response process))
693 (goto-char (point-min))
694 (while (looking-at "\\([^ \n\t]*\\) \\([^ \n\t]*\\)")
695 (setq msgno (string-to-int (match-string 1))
696 len (string-to-int (match-string 2)))
697 (push (cons msgno len) pairs)
698 (beginning-of-line 2))
699 (cons (length pairs) (nreverse pairs))
702 (defun pop3-top (process msgno &optional lines)
703 "Return the top LINES of messages for PROCESS and MSGNO.
704 If msgno is invalid, return nil. Otherwise, return a string."
705 (pop3-send-command process (format "TOP %d %d" msgno (or lines 1)))
706 (if (pop3-read-response process t)
707 nil ;; MSGNO is not valid number
709 (apply 'buffer-substring (pop3-get-extended-response process)))
714 (defun pop3-get-extended-response (process)
715 "Get the extended pop3 response in the PROCESS buffer."
716 (let ((start pop3-read-point) end)
717 (set-buffer (process-buffer process))
719 (while (not (re-search-forward "^\\.\r\n" nil t))
720 (accept-process-output process 3)
722 (setq pop3-read-point (point-marker))
723 (goto-char (match-beginning 0))
724 (setq end (point-marker))
725 (pop3-clean-region start end)
729 ;; Summary of POP3 (Post Office Protocol version 3) commands and responses
731 ;;; AUTHORIZATION STATE
733 ;; Initial TCP connection
735 ;; Restrictions: none
736 ;; Possible responses:
737 ;; +OK [POP3 server ready]
740 ;; Arguments: a server specific user-id (required)
741 ;; Restrictions: authorization state [after unsuccessful USER or PASS
742 ;; Possible responses:
743 ;; +OK [valid user-id]
744 ;; -ERR [invalid user-id]
747 ;; Arguments: a server/user-id specific password (required)
748 ;; Restrictions: authorization state, after successful USER
749 ;; Possible responses:
750 ;; +OK [maildrop locked and ready]
751 ;; -ERR [invalid password]
752 ;; -ERR [unable to lock maildrop]
756 ;; Restrictions: authorization state
757 ;; Possible responses:
758 ;; +OK [negotiation is ready]
759 ;; -ERR [security layer is already active]
761 ;;; TRANSACTION STATE
765 ;; Restrictions: transaction state
766 ;; Possible responses:
767 ;; +OK nn mm [# of messages, size of maildrop]
770 ;; Arguments: a message-id (optional)
771 ;; Restrictions: transaction state; msg must not be deleted
772 ;; Possible responses:
773 ;; +OK [scan listing follows]
774 ;; -ERR [no such message]
777 ;; Arguments: a message-id (required), number of lines (optional)
778 ;; Restrictions: transaction state; msg must not be deleted
779 ;; Possible responses:
780 ;; +OK [partial message listing follows]
781 ;; -ERR [no such message]
784 ;; Arguments: a message-id (optional)
785 ;; Restrictions: transaction state; msg must not be deleted
786 ;; Possible responses:
787 ;; +OK [uidl listing follows]
788 ;; -ERR [no such message]
791 ;; Arguments: a message-id (required)
792 ;; Restrictions: transaction state; msg must not be deleted
793 ;; Possible responses:
794 ;; +OK [message contents follow]
795 ;; -ERR [no such message]
798 ;; Arguments: a message-id (required)
799 ;; Restrictions: transaction state; msg must not be deleted
800 ;; Possible responses:
801 ;; +OK [message deleted]
802 ;; -ERR [no such message]
806 ;; Restrictions: transaction state
807 ;; Possible responses:
812 ;; Restrictions: transaction state
813 ;; Possible responses:
814 ;; +OK nn [highest numbered message accessed]
818 ;; Restrictions: transaction state
819 ;; Possible responses:
820 ;; +OK [all delete marks removed]
826 ;; Restrictions: none
827 ;; Possible responses:
828 ;; +OK [TCP connection closed]
832 ;;; pop3.el ends here