1 ;;; pop3.el --- Post Office Protocol (RFC 1460) interface
3 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
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 'starttls-open-stream "starttls")
104 (autoload 'starttls-negotiate "starttls"))
106 (defvar pop3-ssl-program-name
107 (if (exec-installed-p "openssl")
110 "The program to run in a subprocess to open an SSL connection.")
112 (defvar pop3-ssl-program-arguments
113 '("s_client" "-quiet")
114 "Arguments to be passed to the program `pop3-ssl-program-name'.")
116 (defun pop3-progress-message (format percent &rest args)
117 (apply (function message) format args))
119 (defun pop3-movemail (&optional crashbox)
120 "Transfer contents of a maildrop to the specified CRASHBOX."
121 (or crashbox (setq crashbox (expand-file-name "~/.crashbox")))
122 (let* ((process (pop3-open-server pop3-mailhost pop3-port))
123 (crashbuf (get-buffer-create " *pop3-retr*"))
126 (pop3-password pop3-password)
127 (pop3-uidl-file-name (convert-standard-filename
128 (concat pop3-uidl-file-name "-"
130 retrieved-messages messages)
131 ;; for debugging only
132 (if pop3-debug (switch-to-buffer (process-buffer process)))
133 ;; query for password
134 (if (and pop3-password-required (not pop3-password))
136 (read-passwd (format "Password for %s: " pop3-maildrop))))
137 (cond ((equal 'apop pop3-authentication-scheme)
138 (pop3-apop process pop3-maildrop))
139 ((equal 'pass pop3-authentication-scheme)
140 (pop3-user process pop3-maildrop)
142 (t (error "Invalid POP3 authentication scheme")))
143 ;; get messages that are suitable for download
144 (message "Retrieving message list...")
145 (setq messages (pop3-get-message-numbers process)
146 message-count (length (cdr messages)))
147 (message "Retrieving message list...%d of %d unread"
148 message-count (pop messages))
150 (unless (not (stringp crashbox))
152 (pop3-progress-message
153 "Retrieving message %d of %d (%d octets) from %s..."
154 (floor (* (/ (float n) message-count) 100))
155 n message-count (cdar messages) pop3-mailhost)
156 (pop3-retr process (caar messages) crashbuf)
157 (push (caar messages) retrieved-messages)
158 (setq messages (cdr messages)
160 (with-current-buffer crashbuf
161 (write-region-as-binary (point-min) (point-max)
162 crashbox 'append 'nomesg))
163 ;; mark messages as read
164 (when pop3-leave-mail-on-server
166 ;; now delete the messages we have retrieved
167 (unless pop3-leave-mail-on-server
168 (dolist (n retrieved-messages)
169 (message "Deleting message %d of %d from %s..."
170 n message-count pop3-mailhost)
171 (pop3-dele process n)))
174 (kill-buffer crashbuf)
177 (defun pop3-get-message-count ()
178 "Return the number of messages in the maildrop."
179 (let* ((process (pop3-open-server pop3-mailhost pop3-port))
181 (pop3-password pop3-password)
183 ;; for debugging only
184 (if pop3-debug (switch-to-buffer (process-buffer process)))
185 ;; query for password
186 (if (and pop3-password-required (not pop3-password))
188 (read-passwd (format "Password for %s: " pop3-maildrop))))
189 (cond ((equal 'apop pop3-authentication-scheme)
190 (pop3-apop process pop3-maildrop))
191 ((equal 'pass pop3-authentication-scheme)
192 (pop3-user process pop3-maildrop)
194 (t (error "Invalid POP3 authentication scheme")))
195 (setq message-count (car (pop3-stat process)))
199 (defun pop3-open-server (mailhost port)
200 "Open TCP connection to MAILHOST on PORT.
201 Returns the process associated with the connection.
202 Argument PORT specifies connecting port."
205 (set-buffer (get-buffer-create (concat " trace of POP session to "
208 (setq pop3-read-point (point-min))
212 ((eq pop3-connection-type 'ssl)
213 (pop3-open-ssl-stream "POP" (current-buffer) mailhost port))
214 ((eq pop3-connection-type 'tls)
215 (pop3-open-tls-stream "POP" (current-buffer) mailhost port))
217 (open-network-stream-as-binary "POP" (current-buffer)
219 (let ((response (pop3-read-response process t)))
221 (substring response (or (string-match "<" response) 0)
222 (+ 1 (or (string-match ">" response) -1)))))
225 (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 (nnheader-accept-process-output process)
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."
252 (or (pop3-open-ssl-stream-1 name buffer host service "-ssl3")
253 (pop3-open-ssl-stream-1 name buffer host service "-ssl2"))))
255 (defun pop3-open-tls-stream (name buffer host service)
256 "Open a TLSv1 connection for a service to a host.
257 Returns a subprocess-object to represent the connection.
258 Args are NAME BUFFER HOST SERVICE."
260 (as-binary-process (starttls-open-stream
261 name buffer host service))))
263 (starttls-negotiate process)
268 (defun pop3-process-filter (process output)
270 (set-buffer (process-buffer process))
271 (goto-char (point-max))
274 (defun pop3-send-command (process command)
275 (set-buffer (process-buffer process))
276 (goto-char (point-max))
277 ;; (if (= (aref command 0) ?P)
278 ;; (insert "PASS <omitted>\r\n")
279 ;; (insert command "\r\n"))
280 (setq pop3-read-point (point))
281 (goto-char (point-max))
282 (process-send-string process (concat command "\r\n"))
285 (defun pop3-read-response (process &optional return)
286 "Read the response from the server PROCESS.
287 Return the response string if optional second argument RETURN is non-nil."
288 (let ((case-fold-search nil)
291 (set-buffer (process-buffer process))
292 (goto-char pop3-read-point)
293 (while (not (search-forward "\r\n" nil t))
294 (nnheader-accept-process-output process)
295 (goto-char pop3-read-point))
296 (setq match-end (point))
297 (goto-char pop3-read-point)
298 (if (looking-at "-ERR")
299 (error (buffer-substring (point) (- match-end 2)))
300 (if (not (looking-at "+OK"))
301 (progn (setq pop3-read-point match-end) nil)
302 (setq pop3-read-point match-end)
304 (buffer-substring (point) match-end)
308 (defun pop3-clean-region (start end)
309 (setq end (set-marker (make-marker) end))
312 (while (and (< (point) end) (search-forward "\r\n" end t))
313 (replace-match "\n" t t))
315 (while (re-search-forward "\n\n\\(From \\)" end t)
316 (replace-match "\n\n>\\1" t nil))
318 (while (and (< (point) end) (re-search-forward "^\\." end t))
319 (replace-match "" t t)
321 (set-marker end nil))
323 (eval-when-compile (defvar parse-time-months))
325 ;; Copied from message-make-date.
326 (defun pop3-make-date (&optional now)
327 "Make a valid date header.
328 If NOW, use that time instead."
329 (require 'parse-time)
330 (let* ((now (or now (current-time)))
331 (zone (nth 8 (decode-time now)))
335 (setq zone (- zone)))
337 (format-time-string "%d" now)
338 ;; The month name of the %b spec is locale-specific. Pfff.
340 (capitalize (car (rassoc (nth 4 (decode-time now))
341 parse-time-months))))
342 (format-time-string "%Y %H:%M:%S " now)
343 ;; We do all of this because XEmacs doesn't have the %z spec.
344 (format "%s%02d%02d" sign (/ zone 3600) (/ (% zone 3600) 60)))))
346 (defun pop3-munge-message-separator (start end)
347 "Check to see if a message separator exists. If not, generate one."
350 (narrow-to-region start end)
351 (goto-char (point-min))
352 (if (not (or (looking-at "From .?") ; Unix mail
353 (looking-at "\001\001\001\001\n") ; MMDF
354 (looking-at "BABYL OPTIONS:") ; Babyl
356 (let* ((from (mail-strip-quoted-names (mail-fetch-field "From")))
357 (tdate (mail-fetch-field "Date"))
358 (date (split-string (or (and tdate
359 (not (string= "" tdate))
364 ;; sample date formats I have seen
365 ;; Date: Tue, 9 Jul 1996 09:04:21 -0400 (EDT)
366 ;; Date: 08 Jul 1996 23:22:24 -0400
368 ;; Tue Jul 9 09:04:21 1996
371 "Tue Jan 1 00:00:0 1900")
372 ((string-match "[A-Z]" (nth 0 date))
373 (format "%s %s %s %s %s"
374 (nth 0 date) (nth 2 date) (nth 1 date)
375 (nth 4 date) (nth 3 date)))
377 ;; this really needs to be better but I don't feel
378 ;; like writing a date to day converter.
379 (format "Sun %s %s %s %s"
380 (nth 1 date) (nth 0 date)
381 (nth 3 date) (nth 2 date)))
383 (setq From_ (format "\nFrom %s %s\n" from date))
384 (while (string-match "," From_)
385 (setq From_ (concat (substring From_ 0 (match-beginning 0))
386 (substring From_ (match-end 0)))))
387 (goto-char (point-min))
389 (if (search-forward "\n\n" nil t)
391 (goto-char (point-max))
393 (narrow-to-region (point) (point-max))
394 (let ((size (- (point-max) (point-min))))
395 (goto-char (point-min))
398 (insert (format "Content-Length: %s\n" size)))
403 (defun pop3-get-message-numbers (process)
404 "Get the list of message numbers and lengths to retrieve via PROCESS."
405 ;; we use the LIST comand first anyway to get the message lengths.
406 ;; then if we're leaving mail on the server, see if the UIDL command
407 ;; is implemented. if so, we use it to get the message number list.
408 (let* ((messages (pop3-list process))
409 (total (or (pop messages) 0))
410 (uidl (if pop3-leave-mail-on-server
411 (pop3-get-uidl process)))
414 ;; only retrieve messages matching our regexp or in the uidl list
416 ;; remove elements not in the uidl, this assumes the uidl is short
417 (or (not (eq pop3-uidl-support t))
418 (memq (caar messages) uidl))
420 ;; don't download messages that are too large
421 (not (and pop3-maximum-message-size
422 (> (cdar messages) pop3-maximum-message-size)))
423 (not (and pop3-except-header-regexp
424 (string-match pop3-except-header-regexp
425 (pop3-top process (caar messages) 0)))))
426 (push (car messages) out))
427 (setq messages (cdr messages)))
428 (cons total (reverse out))))
430 (defun pop3-get-uidl (process)
431 "Use PROCESS to get a list of unread message numbers."
432 (let ((messages (pop3-uidl process)) uidl)
433 (if (or (null messages) (null pop3-uidl-support))
434 (setq pop3-uidl-support nil)
435 (setq pop3-uidl-support t)
438 (when (file-readable-p pop3-uidl-file-name)
439 (insert-file-contents pop3-uidl-file-name))
440 (goto-char (point-min))
441 (while (looking-at "\\([^ \n\t]+\\)")
442 (set (intern (match-string 1) pop3-uidl-obarray)
446 (dolist (message (cdr messages))
447 (if (setq uidl (intern-soft (cdr message) pop3-uidl-obarray))
448 (setcar (symbol-value uidl) (car message))
449 (set (intern (cdr message) pop3-uidl-obarray)
450 (cons (car message) nil))))
451 (pop3-get-unread-message-numbers))
454 (defun pop3-get-unread-message-numbers ()
455 "Return a sorted list of unread msg numbers to retrieve."
457 (mapatoms (lambda (atom)
458 (if (not (cdr (symbol-value atom)))
459 (push (car (symbol-value atom)) nums)))
463 (defun pop3-save-uidls ()
464 "Save the updated UIDLs to disk for use next time."
465 (when (and pop3-leave-mail-on-server
466 ;; UIDL hash table is non-empty
467 (let ((len (length pop3-uidl-obarray)))
469 (setq len (if (symbolp (aref pop3-uidl-obarray (1- len)))
472 (when (file-readable-p pop3-uidl-file-name)
473 (copy-file pop3-uidl-file-name
474 (concat pop3-uidl-file-name ".old")
475 'overwrite 'keeptime))
477 (with-temp-file pop3-uidl-file-name
480 (when (car (symbol-value atom))
481 (insert (format "%s\n" atom))))
483 (fillarray pop3-uidl-obarray 0)))
488 ;; AUTHORIZATION STATE
490 (defun pop3-user (process user)
491 "Send USER information to POP3 server."
492 (pop3-send-command process (format "USER %s" user))
493 (let ((response (pop3-read-response process t)))
494 (if (not (and response (string-match "+OK" response)))
495 (error (format "USER %s not valid" user)))))
497 (defun pop3-pass (process)
498 "Send authentication information to the server."
499 (pop3-send-command process (format "PASS %s" pop3-password))
500 (let ((response (pop3-read-response process t)))
501 (if (not (and response (string-match "+OK" response)))
502 (pop3-quit process))))
504 ;; When this file is being compiled in the Gnus (not T-gnus) source
505 ;; tree, `md5' might have been defined in w3/md5.el, ./lpath.el or one
506 ;; of some other libraries and `md5' will accept only 3 arguments. We
507 ;; will deceive the byte-compiler not to say warnings.
509 (if (fboundp 'eval-when)
510 ;; `eval-when' might not be provided when loading .el file.
512 (let ((def (assq 'md5 byte-compile-function-environment)))
514 (setcdr def '(lambda (object &optional start end
515 coding-system noerror)))
516 (setq byte-compile-function-environment
517 (cons '(md5 . (lambda (object &optional start end
518 coding-system noerror)))
519 byte-compile-function-environment)))))))
521 ;; Note that `pop3-md5' should never encode a given string to use for
522 ;; the apop authentication.
525 (if (condition-case nil
527 Check whether the 4th argument CODING-SYSTEM is allowed"
530 ;; Emacs 21 or XEmacs 21
531 ;; (md5 OBJECT &optional START END CODING-SYSTEM NOERROR)
532 (defun pop3-md5 (string)
533 (md5 string nil nil 'binary))
534 ;; The reason why the program reaches here:
535 ;; 1. XEmacs 20 is running and the built-in `md5' doesn't
536 ;; allow the 4th argument.
537 ;; 2. `md5' has been defined by one of some lisp libraries.
538 ;; 3. This file is being compiled in the Gnus source tree,
539 ;; and `md5' has been defined in lpath.el.
540 (defalias 'pop3-md5 'md5))
541 ;; The lisp function will be provided by FLIM or other libraries.
542 (autoload 'md5 "md5")
543 (defalias 'pop3-md5 'md5)))
545 (defun pop3-apop (process user)
546 "Send alternate authentication information to the server."
547 (let ((pass pop3-password))
548 (if (and pop3-password-required (not pass))
550 (read-passwd (format "Password for %s: " pop3-maildrop))))
552 (let ((hash (pop3-md5 (concat pop3-timestamp pass))))
553 (pop3-send-command process (format "APOP %s %s" user hash))
554 (let ((response (pop3-read-response process t)))
555 (if (not (and response (string-match "+OK" response)))
556 (pop3-quit process)))))
559 (defun pop3-stls (process)
560 "Query whether TLS extension is supported"
561 (pop3-send-command process "STLS")
562 (let ((response (pop3-read-response process t)))
563 (if (not (and response (string-match "+OK" response)))
564 (pop3-quit process))))
568 (defun pop3-stat (process)
569 "Return the number of messages in the maildrop and the maildrop's size."
570 (pop3-send-command process "STAT")
571 (let ((response (pop3-read-response process t)))
572 (list (string-to-int (nth 1 (split-string response " ")))
573 (string-to-int (nth 2 (split-string response " "))))
576 (defun pop3-retr (process msg crashbuf)
577 "Retrieve message-id MSG to buffer CRASHBUF."
578 (pop3-send-command process (format "RETR %s" msg))
579 (pop3-read-response process)
581 (let ((region (pop3-get-extended-response process)))
582 (pop3-munge-message-separator (car region) (cadr region))
583 (append-to-buffer crashbuf (car region) (cadr region))
584 (delete-region (car region) (cadr region))
587 (defun pop3-dele (process msg)
588 "Mark message-id MSG as deleted."
589 (pop3-send-command process (format "DELE %s" msg))
590 (pop3-read-response process))
592 (defun pop3-noop (process msg)
594 (pop3-send-command process "NOOP")
595 (pop3-read-response process))
597 (defun pop3-last (process)
598 "Return highest accessed message-id number for the session."
599 (pop3-send-command process "LAST")
600 (let ((response (pop3-read-response process t)))
601 (string-to-int (nth 1 (split-string response " ")))
604 (defun pop3-rset (process)
605 "Remove all delete marks from current maildrop."
606 (pop3-send-command process "RSET")
607 (pop3-read-response process))
611 (defun pop3-quit (process)
612 "Close connection to POP3 server.
613 Tell server to remove all messages marked as deleted, unlock the maildrop,
614 and close the connection."
615 (pop3-send-command process "QUIT")
616 (pop3-read-response process t)
619 (set-buffer (process-buffer process))
620 (goto-char (point-max))
621 (delete-process process))))
623 (defun pop3-uidl (process &optional msgno)
624 "Return the results of a UIDL command in PROCESS for optional MSGNO.
625 If UIDL is unsupported on this mail server or if msgno is invalid, return nil.
626 Otherwise, return a list in the form
628 (N (1 UIDL-1) (2 UIDL-2) ... (N UIDL-N))
632 N is an integer for the number of UIDLs returned (could be 0)
636 (pop3-send-command process (format "UIDL %d" msgno))
637 (pop3-send-command process "UIDL"))
639 (if (null (pop3-read-response process t))
640 nil ;; UIDL is not supported on this server
644 (apply 'narrow-to-region (pop3-get-extended-response process))
645 (goto-char (point-min))
646 (while (looking-at "\\([^ \n\t]*\\) \\([^ \n\t]*\\)")
647 (setq msgno (string-to-int (match-string 1))
648 uidl (match-string 2))
649 (push (cons msgno uidl) pairs)
650 (beginning-of-line 2))
651 (cons (length pairs) (nreverse pairs))
654 (defun pop3-list (process &optional msgno)
655 "Return the results of a LIST command for PROCESS and optional MSGNO.
656 If (optional) msgno is invalid, return nil. Otherwise, return a list
659 (N (1 LEN-1) (2 LEN-2) ... (N LEN-N))
663 N is an integer for the number of msg/len pairs (could be 0)
664 LEN-n is an integer."
666 (pop3-send-command process (format "LIST %d" msgno))
667 (pop3-send-command process "LIST"))
669 (if (null (pop3-read-response process t))
670 nil ;; MSGNO is not valid number
674 (apply 'narrow-to-region (pop3-get-extended-response process))
675 (goto-char (point-min))
676 (while (looking-at "\\([^ \n\t]*\\) \\([^ \n\t]*\\)")
677 (setq msgno (string-to-int (match-string 1))
678 len (string-to-int (match-string 2)))
679 (push (cons msgno len) pairs)
680 (beginning-of-line 2))
681 (cons (length pairs) (nreverse pairs))
684 (defun pop3-top (process msgno &optional lines)
685 "Return the top LINES of messages for PROCESS and MSGNO.
686 If msgno is invalid, return nil. Otherwise, return a string."
687 (pop3-send-command process (format "TOP %d %d" msgno (or lines 1)))
688 (if (pop3-read-response process t)
689 nil ;; MSGNO is not valid number
691 (apply 'buffer-substring (pop3-get-extended-response process)))
696 (defun pop3-get-extended-response (process)
697 "Get the extended pop3 response in the PROCESS buffer."
698 (let ((start pop3-read-point) end)
699 (set-buffer (process-buffer process))
701 (while (not (re-search-forward "^\\.\r\n" nil t))
702 (nnheader-accept-process-output process)
704 (setq pop3-read-point (point-marker))
705 (goto-char (match-beginning 0))
706 (setq end (point-marker))
707 (pop3-clean-region start end)
711 ;; Summary of POP3 (Post Office Protocol version 3) commands and responses
713 ;;; AUTHORIZATION STATE
715 ;; Initial TCP connection
717 ;; Restrictions: none
718 ;; Possible responses:
719 ;; +OK [POP3 server ready]
722 ;; Arguments: a server specific user-id (required)
723 ;; Restrictions: authorization state [after unsuccessful USER or PASS
724 ;; Possible responses:
725 ;; +OK [valid user-id]
726 ;; -ERR [invalid user-id]
729 ;; Arguments: a server/user-id specific password (required)
730 ;; Restrictions: authorization state, after successful USER
731 ;; Possible responses:
732 ;; +OK [maildrop locked and ready]
733 ;; -ERR [invalid password]
734 ;; -ERR [unable to lock maildrop]
738 ;; Restrictions: authorization state
739 ;; Possible responses:
740 ;; +OK [negotiation is ready]
741 ;; -ERR [security layer is already active]
743 ;;; TRANSACTION STATE
747 ;; Restrictions: transaction state
748 ;; Possible responses:
749 ;; +OK nn mm [# of messages, size of maildrop]
752 ;; Arguments: a message-id (optional)
753 ;; Restrictions: transaction state; msg must not be deleted
754 ;; Possible responses:
755 ;; +OK [scan listing follows]
756 ;; -ERR [no such message]
759 ;; Arguments: a message-id (required), number of lines (optional)
760 ;; Restrictions: transaction state; msg must not be deleted
761 ;; Possible responses:
762 ;; +OK [partial message listing follows]
763 ;; -ERR [no such message]
766 ;; Arguments: a message-id (optional)
767 ;; Restrictions: transaction state; msg must not be deleted
768 ;; Possible responses:
769 ;; +OK [uidl listing follows]
770 ;; -ERR [no such message]
773 ;; Arguments: a message-id (required)
774 ;; Restrictions: transaction state; msg must not be deleted
775 ;; Possible responses:
776 ;; +OK [message contents follow]
777 ;; -ERR [no such message]
780 ;; Arguments: a message-id (required)
781 ;; Restrictions: transaction state; msg must not be deleted
782 ;; Possible responses:
783 ;; +OK [message deleted]
784 ;; -ERR [no such message]
788 ;; Restrictions: transaction state
789 ;; Possible responses:
794 ;; Restrictions: transaction state
795 ;; Possible responses:
796 ;; +OK nn [highest numbered message accessed]
800 ;; Restrictions: transaction state
801 ;; Possible responses:
802 ;; +OK [all delete marks removed]
808 ;; Restrictions: none
809 ;; Possible responses:
810 ;; +OK [TCP connection closed]
814 ;;; pop3.el ends here