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)
50 ;; For compiling this module in Gnus with XEmacs -no-autoloads.
53 ;; as-binary-process, open-network-stream-as-binary, write-region-as-binary
60 (defvar pop3-maildrop (or (user-login-name) (getenv "LOGNAME") (getenv "USER") nil)
62 (defvar pop3-mailhost (or (getenv "MAILHOST") nil)
66 (defvar pop3-connection-type nil
67 "*POP3 connection type.")
69 (defvar pop3-password-required t
70 "*Non-nil if a password is required when connecting to POP server.")
71 (defvar pop3-password nil
72 "*Password to use when connecting to POP server.")
74 (defvar pop3-authentication-scheme 'pass
75 "*POP3 authentication scheme.
76 Defaults to 'pass, for the standard USER/PASS authentication. Other valid
79 (defvar pop3-timestamp nil
80 "Timestamp returned when initially connected to the POP server.
81 Used for APOP authentication.")
83 (defvar pop3-leave-mail-on-server nil
84 "Non-nil if mail is to be left on the server and UIDL used for message retrieval.")
86 (defvar pop3-maximum-message-size nil
87 "If non-nil only download messages smaller than this.")
89 (defvar pop3-except-header-regexp nil
90 "If non-nil we do not retrieve messages whose headers are matching this regexp.")
92 (defvar pop3-uidl-file-name "~/.uidls"
93 "File in which to store the UIDL of processed messages.")
95 (defvar pop3-uidl-support nil
96 "Alist of servers and flags of whether they support UIDLs.
97 Users don't have to set this value.")
99 (defvar pop3-uidl-obarray (make-vector 31 0)
102 (defvar pop3-read-point nil)
103 (defvar pop3-debug nil)
106 (autoload 'starttls-open-stream "starttls")
107 (autoload 'starttls-negotiate "starttls"))
109 (defvar pop3-ssl-program-name
110 (if (exec-installed-p "openssl")
113 "The program to run in a subprocess to open an SSL connection.")
115 (defvar pop3-ssl-program-arguments
116 '("s_client" "-quiet")
117 "Arguments to be passed to the program `pop3-ssl-program-name'.")
119 (defun pop3-progress-message (format percent &rest args)
120 (apply (function message) format args))
122 (defun pop3-movemail (&optional crashbox)
123 "Transfer contents of a maildrop to the specified CRASHBOX."
124 (or crashbox (setq crashbox (expand-file-name "~/.crashbox")))
125 (let* ((process (pop3-open-server pop3-mailhost pop3-port))
126 (crashbuf (get-buffer-create " *pop3-retr*"))
129 (pop3-password pop3-password)
130 (pop3-uidl-file-name (convert-standard-filename
131 (concat pop3-uidl-file-name "-"
133 retrieved-messages messages)
134 ;; for debugging only
135 (if pop3-debug (switch-to-buffer (process-buffer process)))
136 ;; query for password
137 (if (and pop3-password-required (not pop3-password))
139 (read-passwd (format "Password for %s: " pop3-maildrop))))
140 (cond ((equal 'apop pop3-authentication-scheme)
141 (pop3-apop process pop3-maildrop))
142 ((equal 'pass pop3-authentication-scheme)
143 (pop3-user process pop3-maildrop)
145 (t (error "Invalid POP3 authentication scheme")))
146 ;; get messages that are suitable for download
147 (message "Retrieving message list...")
148 (setq messages (pop3-get-message-numbers process)
149 message-count (length (cdr messages)))
150 (message "Retrieving message list...%d of %d unread"
151 message-count (pop messages))
153 (unless (not (stringp crashbox))
155 (pop3-progress-message
156 "Retrieving message %d of %d (%d octets) from %s..."
157 (floor (* (/ (float n) message-count) 100))
158 n message-count (cdar messages) pop3-mailhost)
159 (pop3-retr process (caar messages) crashbuf)
160 (push (caar messages) retrieved-messages)
161 (setq messages (cdr messages)
163 (with-current-buffer crashbuf
164 (write-region-as-binary (point-min) (point-max)
165 crashbox 'append 'nomesg))
166 ;; mark messages as read
167 (when pop3-leave-mail-on-server
169 ;; now delete the messages we have retrieved
170 (unless pop3-leave-mail-on-server
171 (dolist (n retrieved-messages)
172 (message "Deleting message %d of %d from %s..."
173 n message-count pop3-mailhost)
174 (pop3-dele process n)))
177 (kill-buffer crashbuf)
180 (defun pop3-get-message-count ()
181 "Return the number of messages in the maildrop."
182 (let* ((process (pop3-open-server pop3-mailhost pop3-port))
184 (pop3-password pop3-password)
186 ;; for debugging only
187 (if pop3-debug (switch-to-buffer (process-buffer process)))
188 ;; query for password
189 (if (and pop3-password-required (not pop3-password))
191 (read-passwd (format "Password for %s: " pop3-maildrop))))
192 (cond ((equal 'apop pop3-authentication-scheme)
193 (pop3-apop process pop3-maildrop))
194 ((equal 'pass pop3-authentication-scheme)
195 (pop3-user process pop3-maildrop)
197 (t (error "Invalid POP3 authentication scheme")))
198 (setq message-count (car (pop3-stat process)))
202 (defun pop3-open-server (mailhost port)
203 "Open TCP connection to MAILHOST on PORT.
204 Returns the process associated with the connection.
205 Argument PORT specifies connecting port."
208 (set-buffer (get-buffer-create (concat " trace of POP session to "
211 (setq pop3-read-point (point-min))
215 ((eq pop3-connection-type 'ssl)
216 (pop3-open-ssl-stream "POP" (current-buffer) mailhost port))
217 ((eq pop3-connection-type 'tls)
218 (pop3-open-tls-stream "POP" (current-buffer) mailhost port))
220 (open-network-stream-as-binary "POP" (current-buffer)
222 (let ((response (pop3-read-response process t)))
224 (substring response (or (string-match "<" response) 0)
225 (+ 1 (or (string-match ">" response) -1)))))
228 (defun pop3-open-ssl-stream-1 (name buffer host service extra-arg)
230 (let* ((ssl-program-name
231 pop3-ssl-program-name)
232 (ssl-program-arguments
233 `(,@pop3-ssl-program-arguments
235 "-connect" ,(format "%s:%d" host service)))
236 (process (open-ssl-stream name buffer host service)))
238 (with-current-buffer buffer
239 (goto-char (point-min))
240 (while (and (memq (process-status process) '(open run))
241 (goto-char (point-max))
243 (not (looking-at "+OK")))
244 (nnheader-accept-process-output process)
246 (delete-region (point-min) (point)))
247 (and process (memq (process-status process) '(open run))
250 (defun pop3-open-ssl-stream (name buffer host service)
251 "Open a SSL connection for a service to a host.
252 Returns a subprocess-object to represent the connection.
253 Args are NAME BUFFER HOST SERVICE."
255 (or (pop3-open-ssl-stream-1 name buffer host service "-ssl3")
256 (pop3-open-ssl-stream-1 name buffer host service "-ssl2"))))
258 (defun pop3-open-tls-stream (name buffer host service)
259 "Open a TLSv1 connection for a service to a host.
260 Returns a subprocess-object to represent the connection.
261 Args are NAME BUFFER HOST SERVICE."
263 (as-binary-process (starttls-open-stream
264 name buffer host service))))
266 (starttls-negotiate process)
271 (defun pop3-process-filter (process output)
273 (set-buffer (process-buffer process))
274 (goto-char (point-max))
277 (defun pop3-send-command (process command)
278 (set-buffer (process-buffer process))
279 (goto-char (point-max))
280 ;; (if (= (aref command 0) ?P)
281 ;; (insert "PASS <omitted>\r\n")
282 ;; (insert command "\r\n"))
283 (setq pop3-read-point (point))
284 (goto-char (point-max))
285 (process-send-string process (concat command "\r\n"))
288 (defun pop3-read-response (process &optional return)
289 "Read the response from the server PROCESS.
290 Return the response string if optional second argument RETURN is non-nil."
291 (let ((case-fold-search nil)
294 (set-buffer (process-buffer process))
295 (goto-char pop3-read-point)
296 (while (and (memq (process-status process) '(open run))
297 (not (search-forward "\r\n" nil t)))
298 (nnheader-accept-process-output process)
299 (goto-char pop3-read-point))
300 (setq match-end (point))
301 (goto-char pop3-read-point)
302 (if (looking-at "-ERR")
303 (error (buffer-substring (point) (- match-end 2)))
304 (if (not (looking-at "+OK"))
305 (progn (setq pop3-read-point match-end) nil)
306 (setq pop3-read-point match-end)
308 (buffer-substring (point) match-end)
312 (defun pop3-clean-region (start end)
313 (setq end (set-marker (make-marker) end))
316 (while (and (< (point) end) (search-forward "\r\n" end t))
317 (replace-match "\n" t t))
319 (while (re-search-forward "\n\n\\(From \\)" end t)
320 (replace-match "\n\n>\\1" t nil))
322 (while (and (< (point) end) (re-search-forward "^\\." end t))
323 (replace-match "" t t)
325 (set-marker end nil))
327 (eval-when-compile (defvar parse-time-months))
329 ;; Copied from message-make-date.
330 (defun pop3-make-date (&optional now)
331 "Make a valid date header.
332 If NOW, use that time instead."
333 (require 'parse-time)
334 (let* ((now (or now (current-time)))
335 (zone (nth 8 (decode-time now)))
339 (setq zone (- zone)))
341 (format-time-string "%d" now)
342 ;; The month name of the %b spec is locale-specific. Pfff.
344 (capitalize (car (rassoc (nth 4 (decode-time now))
345 parse-time-months))))
346 (format-time-string "%Y %H:%M:%S " now)
347 ;; We do all of this because XEmacs doesn't have the %z spec.
348 (format "%s%02d%02d" sign (/ zone 3600) (/ (% zone 3600) 60)))))
350 (defun pop3-munge-message-separator (start end)
351 "Check to see if a message separator exists. If not, generate one."
354 (narrow-to-region start end)
355 (goto-char (point-min))
356 (if (not (or (looking-at "From .?") ; Unix mail
357 (looking-at "\001\001\001\001\n") ; MMDF
358 (looking-at "BABYL OPTIONS:") ; Babyl
360 (let* ((from (mail-strip-quoted-names (mail-fetch-field "From")))
361 (tdate (mail-fetch-field "Date"))
362 (date (split-string (or (and tdate
363 (not (string= "" tdate))
368 ;; sample date formats I have seen
369 ;; Date: Tue, 9 Jul 1996 09:04:21 -0400 (EDT)
370 ;; Date: 08 Jul 1996 23:22:24 -0400
372 ;; Tue Jul 9 09:04:21 1996
375 "Tue Jan 1 00:00:0 1900")
376 ((string-match "[A-Z]" (nth 0 date))
377 (format "%s %s %s %s %s"
378 (nth 0 date) (nth 2 date) (nth 1 date)
379 (nth 4 date) (nth 3 date)))
381 ;; this really needs to be better but I don't feel
382 ;; like writing a date to day converter.
383 (format "Sun %s %s %s %s"
384 (nth 1 date) (nth 0 date)
385 (nth 3 date) (nth 2 date)))
387 (setq From_ (format "\nFrom %s %s\n" from date))
388 (while (string-match "," From_)
389 (setq From_ (concat (substring From_ 0 (match-beginning 0))
390 (substring From_ (match-end 0)))))
391 (goto-char (point-min))
393 (if (search-forward "\n\n" nil t)
395 (goto-char (point-max))
397 (narrow-to-region (point) (point-max))
398 (let ((size (- (point-max) (point-min))))
399 (goto-char (point-min))
402 (insert (format "Content-Length: %s\n" size)))
407 (defun pop3-get-message-numbers (process)
408 "Get the list of message numbers and lengths to retrieve via PROCESS."
409 ;; we use the LIST comand first anyway to get the message lengths.
410 ;; then if we're leaving mail on the server, see if the UIDL command
411 ;; is implemented. if so, we use it to get the message number list.
412 (let* ((messages (pop3-list process))
413 (total (or (pop messages) 0))
414 (uidl (if pop3-leave-mail-on-server
415 (pop3-get-uidl process)))
418 ;; only retrieve messages matching our regexp or in the uidl list
420 ;; remove elements not in the uidl, this assumes the uidl is short
421 (or (not (and pop3-leave-mail-on-server
422 (cdr (assoc pop3-mailhost pop3-uidl-support))))
423 (memq (caar messages) uidl))
425 ;; don't download messages that are too large
426 (not (and pop3-maximum-message-size
427 (> (cdar messages) pop3-maximum-message-size)))
428 (not (and pop3-except-header-regexp
429 (string-match pop3-except-header-regexp
430 (pop3-top process (caar messages) 0)))))
431 (push (car messages) out))
432 (setq messages (cdr messages)))
433 (cons total (nreverse out))))
435 (defun pop3-get-uidl (process)
436 "Use PROCESS to get a list of unread message numbers."
437 (let ((messages (pop3-uidl process))
438 (support (assoc pop3-mailhost pop3-uidl-support))
441 (setcdr support (and messages t))
442 (push (cons pop3-mailhost (and messages t))
447 (when (file-readable-p pop3-uidl-file-name)
448 (insert-file-contents pop3-uidl-file-name))
449 (goto-char (point-min))
450 (while (looking-at "\\([^ \n\t]+\\)")
451 (set (intern (match-string 1) pop3-uidl-obarray)
454 (dolist (message (cdr messages))
455 (if (setq uidl (intern-soft (cdr message) pop3-uidl-obarray))
456 (setcar (symbol-value uidl) (car message))
457 (set (intern (cdr message) pop3-uidl-obarray)
458 (cons (car message) nil))))
459 (pop3-get-unread-message-numbers))))
461 (defun pop3-get-unread-message-numbers ()
462 "Return a sorted list of unread msg numbers to retrieve."
464 (mapatoms (lambda (atom)
465 (if (not (cdr (symbol-value atom)))
466 (push (car (symbol-value atom)) nums)))
470 (defun pop3-save-uidls ()
471 "Save the updated UIDLs to disk for use next time."
472 (when (and pop3-leave-mail-on-server
473 ;; UIDL hash table is non-empty
474 (let ((len (length pop3-uidl-obarray)))
476 (setq len (if (symbolp (aref pop3-uidl-obarray (1- len)))
479 (when (file-readable-p pop3-uidl-file-name)
480 (copy-file pop3-uidl-file-name
481 (concat pop3-uidl-file-name ".old")
482 'overwrite 'keeptime))
484 (with-temp-file pop3-uidl-file-name
487 (when (car (symbol-value atom))
488 (insert (format "%s\n" atom))))
490 (fillarray pop3-uidl-obarray 0)))
495 ;; AUTHORIZATION STATE
497 (defun pop3-user (process user)
498 "Send USER information to POP3 server."
499 (pop3-send-command process (format "USER %s" user))
500 (let ((response (pop3-read-response process t)))
501 (if (not (and response (string-match "+OK" response)))
502 (error (format "USER %s not valid" user)))))
504 (defun pop3-pass (process)
505 "Send authentication information to the server."
506 (pop3-send-command process (format "PASS %s" pop3-password))
507 (let ((response (pop3-read-response process t)))
508 (if (not (and response (string-match "+OK" response)))
509 (pop3-quit process))))
511 ;; When this file is being compiled in the Gnus (not T-gnus) source
512 ;; tree, `md5' might have been defined in w3/md5.el, ./lpath.el or one
513 ;; of some other libraries and `md5' will accept only 3 arguments. We
514 ;; will deceive the byte-compiler not to say warnings.
516 (if (boundp 'byte-compile-function-environment)
517 (let ((def (assq 'md5 byte-compile-function-environment)))
519 (setcdr def '(lambda (object &optional start end
520 coding-system noerror)))
521 (setq byte-compile-function-environment
522 (cons '(md5 . (lambda (object &optional start end
523 coding-system noerror)))
524 byte-compile-function-environment))))))
526 ;; Note that `pop3-md5' should never encode a given string to use for
527 ;; the apop authentication.
530 (if (condition-case nil
532 Check whether the 4th argument CODING-SYSTEM is allowed"
535 ;; Emacs 21 or XEmacs 21
536 ;; (md5 OBJECT &optional START END CODING-SYSTEM NOERROR)
537 (defun pop3-md5 (string)
538 (md5 string nil nil 'binary))
539 ;; The reason why the program reaches here:
540 ;; 1. XEmacs 20 is running and the built-in `md5' doesn't
541 ;; allow the 4th argument.
542 ;; 2. `md5' has been defined by one of some lisp libraries.
543 ;; 3. This file is being compiled in the Gnus source tree,
544 ;; and `md5' has been defined in lpath.el.
545 (defalias 'pop3-md5 'md5))
546 ;; The lisp function will be provided by FLIM or other libraries.
547 (autoload 'md5 "md5")
548 (defalias 'pop3-md5 'md5)))
550 (defun pop3-apop (process user)
551 "Send alternate authentication information to the server."
552 (let ((pass pop3-password))
553 (if (and pop3-password-required (not pass))
555 (read-passwd (format "Password for %s: " pop3-maildrop))))
557 (let ((hash (pop3-md5 (concat pop3-timestamp pass))))
558 (pop3-send-command process (format "APOP %s %s" user hash))
559 (let ((response (pop3-read-response process t)))
560 (if (not (and response (string-match "+OK" response)))
561 (pop3-quit process)))))
564 (defun pop3-stls (process)
565 "Query whether TLS extension is supported"
566 (pop3-send-command process "STLS")
567 (let ((response (pop3-read-response process t)))
568 (if (not (and response (string-match "+OK" response)))
569 (pop3-quit process))))
573 (defun pop3-stat (process)
574 "Return the number of messages in the maildrop and the maildrop's size."
575 (pop3-send-command process "STAT")
576 (let ((response (pop3-read-response process t)))
577 (list (string-to-int (nth 1 (split-string response " ")))
578 (string-to-int (nth 2 (split-string response " "))))
581 (defun pop3-retr (process msg crashbuf)
582 "Retrieve message-id MSG to buffer CRASHBUF."
583 (pop3-send-command process (format "RETR %s" msg))
584 (pop3-read-response process)
586 (let ((region (pop3-get-extended-response process)))
587 (pop3-munge-message-separator (car region) (cadr region))
588 (append-to-buffer crashbuf (car region) (cadr region))
589 (delete-region (car region) (cadr region))
592 (defun pop3-dele (process msg)
593 "Mark message-id MSG as deleted."
594 (pop3-send-command process (format "DELE %s" msg))
595 (pop3-read-response process))
597 (defun pop3-noop (process msg)
599 (pop3-send-command process "NOOP")
600 (pop3-read-response process))
602 (defun pop3-last (process)
603 "Return highest accessed message-id number for the session."
604 (pop3-send-command process "LAST")
605 (let ((response (pop3-read-response process t)))
606 (string-to-int (nth 1 (split-string response " ")))
609 (defun pop3-rset (process)
610 "Remove all delete marks from current maildrop."
611 (pop3-send-command process "RSET")
612 (pop3-read-response process))
616 (defun pop3-quit (process)
617 "Close connection to POP3 server.
618 Tell server to remove all messages marked as deleted, unlock the maildrop,
619 and close the connection."
620 (pop3-send-command process "QUIT")
621 (pop3-read-response process t)
624 (set-buffer (process-buffer process))
625 (goto-char (point-max))
626 (delete-process process))))
628 (defun pop3-uidl (process &optional msgno)
629 "Return the results of a UIDL command in PROCESS for optional MSGNO.
630 If UIDL is unsupported on this mail server or if msgno is invalid, return nil.
631 Otherwise, return a list in the form
633 (N (1 UIDL-1) (2 UIDL-2) ... (N UIDL-N))
637 N is an integer for the number of UIDLs returned (could be 0)
641 (pop3-send-command process (format "UIDL %d" msgno))
642 (pop3-send-command process "UIDL"))
644 (if (null (pop3-read-response process t))
645 nil ;; UIDL is not supported on this server
649 (apply 'narrow-to-region (pop3-get-extended-response process))
650 (goto-char (point-min))
651 (while (looking-at "\\([^ \n\t]*\\) \\([^ \n\t]*\\)")
652 (setq msgno (string-to-int (match-string 1))
653 uidl (match-string 2))
654 (push (cons msgno uidl) pairs)
655 (beginning-of-line 2))
656 (cons (length pairs) (nreverse pairs))
659 (defun pop3-list (process &optional msgno)
660 "Return the results of a LIST command for PROCESS and optional MSGNO.
661 If (optional) msgno is invalid, return nil. Otherwise, return a list
664 (N (1 LEN-1) (2 LEN-2) ... (N LEN-N))
668 N is an integer for the number of msg/len pairs (could be 0)
669 LEN-n is an integer."
671 (pop3-send-command process (format "LIST %d" msgno))
672 (pop3-send-command process "LIST"))
674 (if (null (pop3-read-response process t))
675 nil ;; MSGNO is not valid number
679 (apply 'narrow-to-region (pop3-get-extended-response process))
680 (goto-char (point-min))
681 (while (looking-at "\\([^ \n\t]*\\) \\([^ \n\t]*\\)")
682 (setq msgno (string-to-int (match-string 1))
683 len (string-to-int (match-string 2)))
684 (push (cons msgno len) pairs)
685 (beginning-of-line 2))
686 (cons (length pairs) (nreverse pairs))
689 (defun pop3-top (process msgno &optional lines)
690 "Return the top LINES of messages for PROCESS and MSGNO.
691 If msgno is invalid, return nil. Otherwise, return a string."
692 (pop3-send-command process (format "TOP %d %d" msgno (or lines 1)))
693 (if (pop3-read-response process t)
694 nil ;; MSGNO is not valid number
696 (apply 'buffer-substring (pop3-get-extended-response process)))
701 (defun pop3-get-extended-response (process)
702 "Get the extended pop3 response in the PROCESS buffer."
703 (let ((start pop3-read-point) end)
704 (set-buffer (process-buffer process))
706 (while (not (re-search-forward "^\\.\r\n" nil t))
707 ;; Fixme: Shouldn't depend on nnheader.
708 (nnheader-accept-process-output process)
710 (setq pop3-read-point (point-marker))
711 (goto-char (match-beginning 0))
712 (setq end (point-marker))
713 (pop3-clean-region start end)
717 ;; Summary of POP3 (Post Office Protocol version 3) commands and responses
719 ;;; AUTHORIZATION STATE
721 ;; Initial TCP connection
723 ;; Restrictions: none
724 ;; Possible responses:
725 ;; +OK [POP3 server ready]
728 ;; Arguments: a server specific user-id (required)
729 ;; Restrictions: authorization state [after unsuccessful USER or PASS
730 ;; Possible responses:
731 ;; +OK [valid user-id]
732 ;; -ERR [invalid user-id]
735 ;; Arguments: a server/user-id specific password (required)
736 ;; Restrictions: authorization state, after successful USER
737 ;; Possible responses:
738 ;; +OK [maildrop locked and ready]
739 ;; -ERR [invalid password]
740 ;; -ERR [unable to lock maildrop]
744 ;; Restrictions: authorization state
745 ;; Possible responses:
746 ;; +OK [negotiation is ready]
747 ;; -ERR [security layer is already active]
749 ;;; TRANSACTION STATE
753 ;; Restrictions: transaction state
754 ;; Possible responses:
755 ;; +OK nn mm [# of messages, size of maildrop]
758 ;; Arguments: a message-id (optional)
759 ;; Restrictions: transaction state; msg must not be deleted
760 ;; Possible responses:
761 ;; +OK [scan listing follows]
762 ;; -ERR [no such message]
765 ;; Arguments: a message-id (required), number of lines (optional)
766 ;; Restrictions: transaction state; msg must not be deleted
767 ;; Possible responses:
768 ;; +OK [partial message listing follows]
769 ;; -ERR [no such message]
772 ;; Arguments: a message-id (optional)
773 ;; Restrictions: transaction state; msg must not be deleted
774 ;; Possible responses:
775 ;; +OK [uidl listing follows]
776 ;; -ERR [no such message]
779 ;; Arguments: a message-id (required)
780 ;; Restrictions: transaction state; msg must not be deleted
781 ;; Possible responses:
782 ;; +OK [message contents follow]
783 ;; -ERR [no such message]
786 ;; Arguments: a message-id (required)
787 ;; Restrictions: transaction state; msg must not be deleted
788 ;; Possible responses:
789 ;; +OK [message deleted]
790 ;; -ERR [no such message]
794 ;; Restrictions: transaction state
795 ;; Possible responses:
800 ;; Restrictions: transaction state
801 ;; Possible responses:
802 ;; +OK nn [highest numbered message accessed]
806 ;; Restrictions: transaction state
807 ;; Possible responses:
808 ;; +OK [all delete marks removed]
814 ;; Restrictions: none
815 ;; Possible responses:
816 ;; +OK [TCP connection closed]
820 ;;; pop3.el ends here