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;;; smtpmail.el --- simple SMTP protocol (RFC 821) for sending mail
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;; Copyright (C) 1995-1996, 2001-2012 Free Software Foundation, Inc.
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;; Author: Tomoji Kagatani <kagatani@rbc.ncl.omron.co.jp>
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;; Maintainer: Simon Josefsson <simon@josefsson.org>
;; w32 Maintainer: Brian D. Carlstrom <bdc@ai.mit.edu>
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;; ESMTP support: Simon Leinen <simon@switch.ch>
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;; Hacked by Mike Taylor, 11th October 1999 to add support for
;; automatically appending a domain to RCPT TO: addresses.
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;; AUTH=LOGIN support: Stephen Cranefield <scranefield@infoscience.otago.ac.nz>
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;; Keywords: mail

;; This file is part of GNU Emacs.

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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
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;; 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
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;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:

;; Send Mail to smtp host from smtpmail temp buffer.

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;; Please add these lines in your .emacs(_emacs) or use customize.
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;;
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;;(setq send-mail-function 'smtpmail-send-it) ; if you use `mail'
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;;(setq message-send-mail-function 'smtpmail-send-it) ; if you use message/Gnus
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;;(setq smtpmail-smtp-server "YOUR SMTP HOST")
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;;(setq smtpmail-local-domain "YOUR DOMAIN NAME")
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;;(setq smtpmail-sendto-domain "YOUR DOMAIN NAME")
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;;(setq smtpmail-debug-info t) ; only to debug problems
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;; To queue mail, set `smtpmail-queue-mail' to t and use
;; `smtpmail-send-queued-mail' to send.
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;; Modified by Stephen Cranefield <scranefield@infoscience.otago.ac.nz>,
;; 22/6/99, to support SMTP Authentication by the AUTH=LOGIN mechanism.
;; See http://help.netscape.com/products/server/messaging/3x/info/smtpauth.html
;; Rewritten by Simon Josefsson to use same credential variable as AUTH
;; support below.

;; Modified by Simon Josefsson <jas@pdc.kth.se>, 22/2/99, to support SMTP
;; Authentication by the AUTH mechanism.
;; See http://www.ietf.org/rfc/rfc2554.txt

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;;; Code:

(require 'sendmail)
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(require 'auth-source)
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(autoload 'mail-strip-quoted-names "mail-utils")
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(autoload 'message-make-date "message")
(autoload 'message-make-message-id "message")
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(autoload 'rfc2104-hash "rfc2104")
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;;;
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(defgroup smtpmail nil
  "SMTP protocol for sending mail."
  :group 'mail)
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(defcustom smtpmail-default-smtp-server nil
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  "Specify default SMTP server.
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This only has effect if you specify it before loading the smtpmail library."
  :type '(choice (const nil) string)
  :group 'smtpmail)
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(defcustom smtpmail-smtp-server
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  (or (getenv "SMTPSERVER") smtpmail-default-smtp-server)
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  "The name of the host running SMTP server."
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  :type '(choice (const nil) string)
  :group 'smtpmail)
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(defcustom smtpmail-smtp-service 25
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  "SMTP service port number.
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The default value would be \"smtp\" or 25."
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  :type '(choice (integer :tag "Port") (string :tag "Service"))
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  :group 'smtpmail)
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(defcustom smtpmail-smtp-user nil
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  "User name to use when looking up credentials in the authinfo file.
If non-nil, only consider credentials for the specified user."
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  :version "24.1"
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  :type '(choice (const nil) string)
  :group 'smtpmail)

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(defcustom smtpmail-local-domain nil
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  "Local domain name without a host name.
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If the function `system-name' returns the full internet address,
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don't define this value."
  :type '(choice (const nil) string)
  :group 'smtpmail)

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(defcustom smtpmail-stream-type nil
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  "Type of SMTP connections to use.
This may be either nil (possibly upgraded to STARTTLS if possible),
or `starttls' (refuse to send if STARTTLS isn't available), or `plain'
\(never use STARTTLS), or `ssl' (to use TLS/SSL)."
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  :version "24.1"
  :group 'smtpmail
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  :type '(choice (const :tag "Possibly upgrade to STARTTLS" nil)
		 (const :tag "Always use STARTTLS" starttls)
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		 (const :tag "Never use STARTTLS" plain)
		 (const :tag "Use TLS/SSL" ssl)))
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(defcustom smtpmail-sendto-domain nil
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  "Local domain name without a host name.
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This is appended (with an @-sign) to any specified recipients which do
not include an @-sign, so that each RCPT TO address is fully qualified.
\(Some configurations of sendmail require this.)

Don't bother to set this unless you have get an error like:
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	Sending failed; 501 <someone>: recipient address must contain a domain."
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  :type '(choice (const nil) string)
  :group 'smtpmail)

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(defcustom smtpmail-debug-info nil
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  "Whether to print info in buffer *trace of SMTP session to <somewhere>*.
See also `smtpmail-debug-verb' which determines if the SMTP protocol should
be verbose as well."
  :type 'boolean
  :group 'smtpmail)

(defcustom smtpmail-debug-verb nil
  "Whether this library sends the SMTP VERB command or not.
The commands enables verbose information from the SMTP server."
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  :type 'boolean
  :group 'smtpmail)

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(defcustom smtpmail-code-conv-from nil
  "Coding system for encoding outgoing mail.
Used for the value of `sendmail-coding-system' when
`select-message-coding-system' is called. "
  :type 'coding-system
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  :group 'smtpmail)
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(defcustom smtpmail-queue-mail nil
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  "Non-nil means mail is queued; otherwise it is sent immediately.
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If queued, it is stored in the directory `smtpmail-queue-dir'
and sent with `smtpmail-send-queued-mail'."
  :type 'boolean
  :group 'smtpmail)

(defcustom smtpmail-queue-dir "~/Mail/queued-mail/"
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  "Directory where `smtpmail.el' stores queued mail."
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  :type 'directory
  :group 'smtpmail)

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(defcustom smtpmail-warn-about-unknown-extensions nil
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  "If set, print warnings about unknown SMTP extensions.
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This is mainly useful for development purposes, to learn about
new SMTP extensions that might be useful to support."
  :type 'boolean
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  :version "21.1"
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  :group 'smtpmail)

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(defcustom smtpmail-queue-index-file "index"
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  "File name of queued mail index.
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This is relative to `smtpmail-queue-dir'."
  :type 'string
  :group 'smtpmail)

;; End of customizable variables.

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(defvar smtpmail-address-buffer)
(defvar smtpmail-recipient-address-list)

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(defvar smtpmail-queue-counter 0)

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;; Buffer-local variable.
(defvar smtpmail-read-point)

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(defconst smtpmail-auth-supported '(cram-md5 plain login)
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  "List of supported SMTP AUTH mechanisms.
The list is in preference order.")
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(defvar smtpmail-mail-address nil
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  "Value to use for envelope-from address for mail from ambient buffer.")
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;;;###autoload
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(defun smtpmail-send-it ()
  (let ((errbuf (if mail-interactive
		    (generate-new-buffer " smtpmail errors")
		  0))
	(tembuf (generate-new-buffer " smtpmail temp"))
	(case-fold-search nil)
	delimline
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	result
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	(mailbuf (current-buffer))
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        ;; Examine this variable now, so that
	;; local binding in the mail buffer will take effect.
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	(smtpmail-mail-address
         (or (and mail-specify-envelope-from (mail-envelope-from))
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             (let ((from (mail-fetch-field "from")))
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	       (and from
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		    (cadr (mail-extract-address-components from))))
	     (smtpmail-user-mail-address)))
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	(smtpmail-code-conv-from
	 (if enable-multibyte-characters
	     (let ((sendmail-coding-system smtpmail-code-conv-from))
	       (select-message-coding-system)))))
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    (unwind-protect
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	(with-current-buffer tembuf
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	  (erase-buffer)
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	  ;; Use the same `buffer-file-coding-system' as in the mail
	  ;; buffer, otherwise any `write-region' invocations (e.g., in
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	  ;; mail-do-fcc below) will annoy with asking for a suitable
	  ;; encoding.
	  (set-buffer-file-coding-system smtpmail-code-conv-from nil t)
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	  (insert-buffer-substring mailbuf)
	  (goto-char (point-max))
	  ;; require one newline at the end.
	  (or (= (preceding-char) ?\n)
	      (insert ?\n))
	  ;; Change header-delimiter to be what sendmail expects.
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	  (mail-sendmail-undelimit-header)
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	  (setq delimline (point-marker))
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          ;; (sendmail-synch-aliases)
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	  (if mail-aliases
	      (expand-mail-aliases (point-min) delimline))
	  (goto-char (point-min))
	  ;; ignore any blank lines in the header
	  (while (and (re-search-forward "\n\n\n*" delimline t)
		      (< (point) delimline))
	    (replace-match "\n"))
	  (let ((case-fold-search t))
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	    ;; We used to process Resent-... headers here,
	    ;; but it was not done properly, and the job
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	    ;; is done correctly in `smtpmail-deduce-address-list'.
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	    ;; Don't send out a blank subject line
	    (goto-char (point-min))
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	    (if (re-search-forward "^Subject:\\([ \t]*\n\\)+\\b" delimline t)
		(replace-match "")
	      ;; This one matches a Subject just before the header delimiter.
	      (if (and (re-search-forward "^Subject:\\([ \t]*\n\\)+" delimline t)
		       (= (match-end 0) delimline))
		  (replace-match "")))
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	    ;; Put the "From:" field in unless for some odd reason
	    ;; they put one in themselves.
	    (goto-char (point-min))
	    (if (not (re-search-forward "^From:" delimline t))
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		(let* ((login smtpmail-mail-address)
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		       (fullname (user-full-name)))
		  (cond ((eq mail-from-style 'angles)
			 (insert "From: " fullname)
			 (let ((fullname-start (+ (point-min) 6))
			       (fullname-end (point-marker)))
			   (goto-char fullname-start)
			   ;; Look for a character that cannot appear unquoted
			   ;; according to RFC 822.
			   (if (re-search-forward "[^- !#-'*+/-9=?A-Z^-~]"
						  fullname-end 1)
			       (progn
				 ;; Quote fullname, escaping specials.
				 (goto-char fullname-start)
				 (insert "\"")
				 (while (re-search-forward "[\"\\]"
							   fullname-end 1)
				   (replace-match "\\\\\\&" t))
				 (insert "\""))))
			 (insert " <" login ">\n"))
			((eq mail-from-style 'parens)
			 (insert "From: " login " (")
			 (let ((fullname-start (point)))
			   (insert fullname)
			   (let ((fullname-end (point-marker)))
			     (goto-char fullname-start)
			     ;; RFC 822 says \ and nonmatching parentheses
			     ;; must be escaped in comments.
			     ;; Escape every instance of ()\ ...
			     (while (re-search-forward "[()\\]" fullname-end 1)
			       (replace-match "\\\\\\&" t))
			     ;; ... then undo escaping of matching parentheses,
			     ;; including matching nested parentheses.
			     (goto-char fullname-start)
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			     (while (re-search-forward
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				     "\\(\\=\\|[^\\]\\(\\\\\\\\\\)*\\)\\\\(\\(\\([^\\]\\|\\\\\\\\\\)*\\)\\\\)"
				     fullname-end 1)
			       (replace-match "\\1(\\3)" t)
			       (goto-char fullname-start))))
			 (insert ")\n"))
			((null mail-from-style)
			 (insert "From: " login "\n")))))
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	    ;; Insert a `Message-Id:' field if there isn't one yet.
	    (goto-char (point-min))
	    (unless (re-search-forward "^Message-Id:" delimline t)
	      (insert "Message-Id: " (message-make-message-id) "\n"))
	    ;; Insert a `Date:' field if there isn't one yet.
	    (goto-char (point-min))
	    (unless (re-search-forward "^Date:" delimline t)
	      (insert "Date: " (message-make-date) "\n"))
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	    ;; Possibly add a MIME header for the current coding system
	    (let (charset)
	      (goto-char (point-min))
	      (and (eq mail-send-nonascii 'mime)
		   (not (re-search-forward "^MIME-version:" delimline t))
		   (progn (skip-chars-forward "\0-\177")
			  (/= (point) (point-max)))
		   smtpmail-code-conv-from
		   (setq charset
			 (coding-system-get smtpmail-code-conv-from
					    'mime-charset))
		   (goto-char delimline)
		   (insert "MIME-version: 1.0\n"
			   "Content-type: text/plain; charset="
			   (symbol-name charset)
			   "\nContent-Transfer-Encoding: 8bit\n")))
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	    ;; Insert an extra newline if we need it to work around
	    ;; Sun's bug that swallows newlines.
	    (goto-char (1+ delimline))
	    (if (eval mail-mailer-swallows-blank-line)
		(newline))
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	    ;; Find and handle any FCC fields.
	    (goto-char (point-min))
	    (if (re-search-forward "^FCC:" delimline t)
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		;; Force `mail-do-fcc' to use the encoding of the mail
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		;; buffer to encode outgoing messages on FCC files.
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		(let ((coding-system-for-write
		       ;; mbox files must have Unix EOLs.
		       (coding-system-change-eol-conversion
			smtpmail-code-conv-from 'unix)))
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		  (mail-do-fcc delimline)))
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	    (if mail-interactive
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		(with-current-buffer errbuf
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		  (erase-buffer))))
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	  ;; Encode the header according to RFC2047.
	  (mail-encode-header (point-min) delimline)
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	  ;;
	  (setq smtpmail-address-buffer (generate-new-buffer "*smtp-mail*"))
	  (setq smtpmail-recipient-address-list
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                (smtpmail-deduce-address-list tembuf (point-min) delimline))
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	  (kill-buffer smtpmail-address-buffer)
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	  (smtpmail-do-bcc delimline)
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          ;; Send or queue
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	  (if (not smtpmail-queue-mail)
	      (if (not (null smtpmail-recipient-address-list))
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		  (when (setq result
			      (smtpmail-via-smtp
			       smtpmail-recipient-address-list tembuf))
		    (error "Sending failed: %s" result))
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		(error "Sending failed; no recipients"))
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	    (let* ((file-data
		    (expand-file-name
		     (format "%s_%i"
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			     (format-time-string "%Y-%m-%d_%H:%M:%S")
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			     (setq smtpmail-queue-counter
				   (1+ smtpmail-queue-counter)))
		     smtpmail-queue-dir))
		   (file-data (convert-standard-filename file-data))
		   (file-elisp (concat file-data ".el"))
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		   (buffer-data (create-file-buffer file-data))
		   (buffer-elisp (create-file-buffer file-elisp))
		   (buffer-scratch "*queue-mail*"))
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	      (unless (file-exists-p smtpmail-queue-dir)
		(make-directory smtpmail-queue-dir t))
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	      (with-current-buffer buffer-data
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		(erase-buffer)
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		(set-buffer-file-coding-system
		 ;; We will be reading the file with no-conversion in
		 ;; smtpmail-send-queued-mail below, so write it out
		 ;; with Unix EOLs.
		 (coding-system-change-eol-conversion
		  (or smtpmail-code-conv-from 'undecided)
		  'unix)
		 nil t)
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		(insert-buffer-substring tembuf)
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		(write-file file-data)
		(set-buffer buffer-elisp)
		(erase-buffer)
		(insert (concat
			 "(setq smtpmail-recipient-address-list '"
			 (prin1-to-string smtpmail-recipient-address-list)
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			 ")\n"))
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		(write-file file-elisp)
		(set-buffer (generate-new-buffer buffer-scratch))
		(insert (concat file-data "\n"))
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		(append-to-file (point-min)
				(point-max)
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                                (expand-file-name smtpmail-queue-index-file
                                                  smtpmail-queue-dir)))
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	      (kill-buffer buffer-scratch)
	      (kill-buffer buffer-data)
	      (kill-buffer buffer-elisp))))
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      (kill-buffer tembuf)
      (if (bufferp errbuf)
	  (kill-buffer errbuf)))))

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;;;###autoload
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(defun smtpmail-send-queued-mail ()
  "Send mail that was queued as a result of setting `smtpmail-queue-mail'."
  (interactive)
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  (with-temp-buffer
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    ;; Get index, get first mail, send it, update index, get second
    ;; mail, send it, etc...
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    (let ((file-msg "")
          (qfile (expand-file-name smtpmail-queue-index-file
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                                   smtpmail-queue-dir))
	  result)
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      (insert-file-contents qfile)
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      (goto-char (point-min))
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      (while (not (eobp))
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	(setq file-msg (buffer-substring (point) (line-end-position)))
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	(load file-msg)
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	;; Insert the message literally: it is already encoded as per
	;; the MIME headers, and code conversions might guess the
	;; encoding wrongly.
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	(with-temp-buffer
	  (let ((coding-system-for-read 'no-conversion))
	    (insert-file-contents file-msg))
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          (let ((smtpmail-mail-address
                 (or (and mail-specify-envelope-from (mail-envelope-from))
                     user-mail-address)))
            (if (not (null smtpmail-recipient-address-list))
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                (when (setq result (smtpmail-via-smtp
				    smtpmail-recipient-address-list
				    (current-buffer)))
		  (error "Sending failed: %s" result))
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              (error "Sending failed; no recipients"))))
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	(delete-file file-msg)
	(delete-file (concat file-msg ".el"))
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	(delete-region (point-at-bol) (point-at-bol 2)))
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      (write-region (point-min) (point-max) qfile))))
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(defun smtpmail-fqdn ()
  (if smtpmail-local-domain
      (concat (system-name) "." smtpmail-local-domain)
    (system-name)))

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(defsubst smtpmail-cred-server (cred)
  (nth 0 cred))

(defsubst smtpmail-cred-port (cred)
  (nth 1 cred))

(defsubst smtpmail-cred-key (cred)
  (nth 2 cred))

(defsubst smtpmail-cred-user (cred)
  (nth 2 cred))

(defsubst smtpmail-cred-cert (cred)
  (nth 3 cred))

(defsubst smtpmail-cred-passwd (cred)
  (nth 3 cred))

(defun smtpmail-find-credentials (cred server port)
  (catch 'done
    (let ((l cred) el)
      (while (setq el (pop l))
	(when (and (equal server (smtpmail-cred-server el))
		   (equal port (smtpmail-cred-port el)))
	  (throw 'done el))))))

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(defun smtpmail-maybe-append-domain (recipient)
  (if (or (not smtpmail-sendto-domain)
	  (string-match "@" recipient))
      recipient
    (concat recipient "@" smtpmail-sendto-domain)))

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(defun smtpmail-intersection (list1 list2)
  (let ((result nil))
    (dolist (el2 list2)
      (when (memq el2 list1)
	(push el2 result)))
    (nreverse result)))

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(defun smtpmail-command-or-throw (process string &optional code)
  (let (ret)
    (smtpmail-send-command process string)
    (unless (smtpmail-ok-p (setq ret (smtpmail-read-response process))
			   code)
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      (throw 'done (format "%s in response to %s"
			   (smtpmail-response-text ret)
			   string)))
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    ret))

(defun smtpmail-try-auth-methods (process supported-extensions host port
					  &optional ask-for-password)
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  (setq port
	(if port
	    (format "%s" port)
	  "smtp"))
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  (let* ((mechs (cdr-safe (assoc 'auth supported-extensions)))
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	 (mech (car (smtpmail-intersection mechs smtpmail-auth-supported)))
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	 (auth-source-creation-prompts
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          '((user  . "SMTP user name for %h: ")
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            (secret . "SMTP password for %u@%h: ")))
         (auth-info (car
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		     (auth-source-search
		      :host host
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		      :port port
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		      :user smtpmail-smtp-user
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		      :max 1
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		      :require (and ask-for-password
				    '(:user :secret))
		      :create ask-for-password)))
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         (user (plist-get auth-info :user))
         (password (plist-get auth-info :secret))
	 (save-function (and ask-for-password
			     (plist-get auth-info :save-function)))
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	 ret)
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    (when (functionp password)
      (setq password (funcall password)))
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    (when (and user
	       (not password))
      ;; The user has stored the user name, but not the password, so
      ;; ask for the password, even if we're not forcing that through
      ;; `ask-for-password'.
      (setq auth-info
	    (car
	     (auth-source-search
	      :max 1
	      :host host
	      :port port
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	      :user smtpmail-smtp-user
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	      :require '(:user :secret)
	      :create t))
	    password (plist-get auth-info :secret)))
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    (when (functionp password)
      (setq password (funcall password)))
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    (let ((result (catch 'done
		    (smtpmail-try-auth-method process mech user password))))
      (if (stringp result)
	  (progn
	    (auth-source-forget+ :host host :port port)
	    (throw 'done result))
	(when save-function
	  (funcall save-function))
	result))))

(defun smtpmail-try-auth-method (process mech user password)
  (let (ret)
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    (cond
     ((or (not mech)
	  (not user)
	  (not password))
      ;; No mechanism, or no credentials.
      mech)
     ((eq mech 'cram-md5)
      (setq ret (smtpmail-command-or-throw process "AUTH CRAM-MD5"))
      (when (eq (car ret) 334)
	(let* ((challenge (substring (cadr ret) 4))
	       (decoded (base64-decode-string challenge))
	       (hash (rfc2104-hash 'md5 64 16 password decoded))
	       (response (concat user " " hash))
	       ;; Osamu Yamane <yamane@green.ocn.ne.jp>:
	       ;; SMTP auth fails because the SMTP server identifies
	       ;; only the first part of the string (delimited by
	       ;; new line characters) as a response from the
	       ;; client, and the rest as distinct commands.

	       ;; In my case, the response string is 80 characters
	       ;; long.  Without the no-line-break option for
	       ;; `base64-encode-string', only the first 76 characters
	       ;; are taken as a response to the server, and the
	       ;; authentication fails.
	       (encoded (base64-encode-string response t)))
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	  (smtpmail-command-or-throw process encoded))))
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     ((eq mech 'login)
      (smtpmail-command-or-throw process "AUTH LOGIN")
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      (smtpmail-command-or-throw process (base64-encode-string user t))
      (smtpmail-command-or-throw process (base64-encode-string password t)))
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     ((eq mech 'plain)
      ;; We used to send an empty initial request, and wait for an
      ;; empty response, and then send the password, but this
      ;; violate a SHOULD in RFC 2222 paragraph 5.1.  Note that this
      ;; is not sent if the server did not advertise AUTH PLAIN in
      ;; the EHLO response.  See RFC 2554 for more info.
      (smtpmail-command-or-throw
       process
       (concat "AUTH PLAIN "
	       (base64-encode-string (concat "\0" user "\0" password) t))
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       235))
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     (t
      (error "Mechanism %s not implemented" mech)))))

(defun smtpmail-response-code (string)
  (when string
    (with-temp-buffer
      (insert string)
      (goto-char (point-min))
      (and (re-search-forward "^\\([0-9]+\\) " nil t)
	   (string-to-number (match-string 1))))))

(defun smtpmail-ok-p (response &optional code)
  (and (car response)
       (integerp (car response))
       (< (car response) 400)
       (or (null code)
	   (= code (car response)))))

(defun smtpmail-response-text (response)
  (mapconcat 'identity (cdr response) "\n"))

(defun smtpmail-query-smtp-server ()
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  "Query for an SMTP server and try to contact it.
If the contact succeeds, customizes and saves `smtpmail-smtp-server'
and `smtpmail-smtp-service'.  This tries standard SMTP ports, and if
none works asks you to supply one.  If you know that you need to use
a non-standard port, you can set `smtpmail-smtp-service' in advance.
Returns an error if the server cannot be contacted."
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  (let ((server (read-string "Outgoing SMTP mail server: "))
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	(ports '(25 587))
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	stream port prompted)
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    (when (and smtpmail-smtp-service
	       (not (member smtpmail-smtp-service ports)))
      (push smtpmail-smtp-service ports))
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    (while (and (not smtpmail-smtp-server)
		(setq port (pop ports)))
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      (if (not (setq stream (condition-case ()
				(open-network-stream "smtp" nil server port)
			      (quit nil)
			      (error nil))))
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	  ;; We've used up the list of default ports, so query the user.
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	  (when (and (not ports)
		     (not prompted))
	    (push (read-number (format "Port number to use when contacting %s? "
				       server))
		  ports)
	    (setq prompted t))
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	(customize-save-variable 'smtpmail-smtp-server server)
	(customize-save-variable 'smtpmail-smtp-service port)
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	(delete-process stream)))
    (unless smtpmail-smtp-server
      (error "Couldn't contact an SMTP server"))))

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(defun smtpmail-user-mail-address ()
  "Return `user-mail-address' if it's a valid email address."
  (and user-mail-address
       (let ((parts (split-string user-mail-address "@")))
	 (and (= (length parts) 2)
	      ;; There's a dot in the domain name.
	      (string-match "\\." (cadr parts))
	      user-mail-address))))

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(defun smtpmail-via-smtp (recipient smtpmail-text-buffer
				    &optional ask-for-password)
  (unless smtpmail-smtp-server
    (smtpmail-query-smtp-server))
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  (let ((process nil)
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	(host (or smtpmail-smtp-server
		  (error "`smtpmail-smtp-server' not defined")))
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	(port smtpmail-smtp-service)
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        ;; `smtpmail-mail-address' should be set to the appropriate
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        ;; buffer-local value by the caller, but in case not:
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        (envelope-from
	 (or smtpmail-mail-address
	     (and mail-specify-envelope-from
		  (mail-envelope-from))
	     (let ((from (mail-fetch-field "from")))
	       (and from
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		    (cadr (mail-extract-address-components from))))
	     (smtpmail-user-mail-address)))
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	response-code
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	process-buffer
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	result
	auth-mechanisms
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	(supported-extensions '()))
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    (unwind-protect
	(catch 'done
	  ;; get or create the trace buffer
	  (setq process-buffer
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		(get-buffer-create
		 (format "*trace of SMTP session to %s*" host)))
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	  ;; clear the trace buffer of old output
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	  (with-current-buffer process-buffer
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	    (setq buffer-undo-list t)
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	    (erase-buffer))

	  ;; open the connection to the server
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	  (let ((coding-system-for-read 'binary)
		(coding-system-for-write 'binary))
	    (setq result
		  (open-network-stream
		   "smtpmail" process-buffer host port
		   :type smtpmail-stream-type
		   :return-list t
		   :capability-command (format "EHLO %s\r\n" (smtpmail-fqdn))
		   :end-of-command "^[0-9]+ .*\r\n"
		   :success "^2.*\n"
		   :always-query-capabilities t
		   :starttls-function
		   (lambda (capabilities)
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		     (and (string-match "[ -]STARTTLS" capabilities)
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			  "STARTTLS\r\n"))
		   :client-certificate t
		   :use-starttls-if-possible t)))
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	  ;; If we couldn't access the server at all, we give up.
	  (unless (setq process (car result))
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	    (throw 'done (if (plist-get (cdr result) :error)
			     (plist-get (cdr result) :error)
			   "Unable to contact server")))
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	  ;; set the send-filter
	  (set-process-filter process 'smtpmail-process-filter)

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	  (let* ((greeting (plist-get (cdr result) :greeting))
		 (code (smtpmail-response-code greeting)))
	    (unless code
	      (throw 'done (format "No greeting: %s" greeting)))
	    (when (>= code 400)
	      (throw 'done (format "Connection not allowed: %s" greeting))))
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	  (with-current-buffer process-buffer
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	    (set-buffer-process-coding-system 'raw-text-unix 'raw-text-unix)
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	    (make-local-variable 'smtpmail-read-point)
	    (setq smtpmail-read-point (point-min))

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	    (let* ((capabilities (plist-get (cdr result) :capabilities))
		   (code (smtpmail-response-code capabilities)))
	      (if (or (null code)
		      (>= code 400))
		  ;; The server didn't accept EHLO, so we fall back on HELO.
		  (smtpmail-command-or-throw
		   process (format "HELO %s" (smtpmail-fqdn)))
		;; EHLO was successful, so we parse the extensions.
		(dolist (line (delete
			       ""
			       (split-string
				(plist-get (cdr result) :capabilities)
				"\r\n")))
		  (let ((name
			 (with-case-table ascii-case-table
			   (mapcar (lambda (s) (intern (downcase s)))
				   (split-string (substring line 4) "[ ]")))))
		    (when (= (length name) 1)
		      (setq name (car name)))
		    (when name
		      (cond ((memq (if (consp name) (car name) name)
				   '(verb xvrb 8bitmime onex xone
					  expn size dsn etrn
					  enhancedstatuscodes
					  help xusr
					  auth=login auth starttls))
			     (setq supported-extensions
				   (cons name supported-extensions)))
			    (smtpmail-warn-about-unknown-extensions
			     (message "Unknown extension %s" name))))))))

	    (setq auth-mechanisms
		  (smtpmail-try-auth-methods
		   process supported-extensions host port
		   ask-for-password))

	    (when (or (member 'onex supported-extensions)
		      (member 'xone supported-extensions))
	      (smtpmail-command-or-throw process (format "ONEX")))

	    (when (and smtpmail-debug-verb
		       (or (member 'verb supported-extensions)
			   (member 'xvrb supported-extensions)))
	      (smtpmail-command-or-throw process (format "VERB")))

	    (when (member 'xusr supported-extensions)
	      (smtpmail-command-or-throw process (format "XUSR")))
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	    ;; MAIL FROM:<sender>
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	    (let ((size-part
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		   (if (or (member 'size supported-extensions)
			   (assoc 'size supported-extensions))
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		       (format " SIZE=%d"
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			       (with-current-buffer smtpmail-text-buffer
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				 ;; size estimate:
				 (+ (- (point-max) (point-min))
				    ;; Add one byte for each change-of-line
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				    ;; because of CR-LF representation:
				    (count-lines (point-min) (point-max)))))
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		     ""))
		  (body-part
		   (if (member '8bitmime supported-extensions)
		       ;; FIXME:
		       ;; Code should be added here that transforms
		       ;; the contents of the message buffer into
		       ;; something the receiving SMTP can handle.
		       ;; For a receiver that supports 8BITMIME, this
		       ;; may mean converting BINARY to BASE64, or
		       ;; adding Content-Transfer-Encoding and the
		       ;; other MIME headers.  The code should also
		       ;; return an indication of what encoding the
		       ;; message buffer is now, i.e. ASCII or
		       ;; 8BITMIME.
		       (if nil
			   " BODY=8BITMIME"
			 "")
		     "")))
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	      (smtpmail-send-command
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	       process (format "MAIL FROM:<%s>%s%s"
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			       envelope-from size-part body-part))
	      (cond
	       ((smtpmail-ok-p (setq result (smtpmail-read-response process)))
		;; Success.
		)
	       ((and auth-mechanisms
		     (not ask-for-password)
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		     (eq (car result) 530))
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		;; We got a "530 auth required", so we close and try
		;; again, this time asking the user for a password.
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		;; We ignore any errors here, because some MTAs just
		;; close the connection immediately after giving the
		;; error message.
		(ignore-errors
		  (smtpmail-send-command process "QUIT")
		  (smtpmail-read-response process))
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		(delete-process process)
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		(setq process nil)
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		(throw 'done
		       (smtpmail-via-smtp recipient smtpmail-text-buffer t)))
	       (t
		;; Return the error code.
		(throw 'done
		       (smtpmail-response-text result)))))
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	    ;; RCPT TO:<recipient>
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	    (let ((n 0))
	      (while (not (null (nth n recipient)))
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		(smtpmail-send-command
		 process (format "RCPT TO:<%s>"
				 (smtpmail-maybe-append-domain
				  (nth n recipient))))
		(cond
		 ((smtpmail-ok-p (setq result (smtpmail-read-response process)))
		  ;; Success.
		  nil)
		 ((and auth-mechanisms
		       (not ask-for-password)
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		       (integerp (car result))
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		       (>= (car result) 550)
		       (<= (car result) 554))
		  ;; We got a "550 relay not permitted" (or the like),
		  ;; and the server accepts credentials, so we try
		  ;; again, but ask for a password first.
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		  (smtpmail-send-command process "QUIT")
		  (smtpmail-read-response process)
		  (delete-process process)
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		  (setq process nil)
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		  (throw 'done
			 (smtpmail-via-smtp recipient smtpmail-text-buffer t)))
		 (t
		  ;; Return the error code.
		  (throw 'done
			 (smtpmail-response-text result))))
		(setq n (1+ n))))

	    ;; Send the contents.
	    (smtpmail-command-or-throw process "DATA")
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	    (smtpmail-send-data process smtpmail-text-buffer)
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	    ;; DATA end "."
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	    (smtpmail-command-or-throw process ".")
	    ;; Return success.
	    nil))
      (when (and process
		 (buffer-live-p process-buffer))
	(with-current-buffer (process-buffer process)
	  (smtpmail-send-command process "QUIT")
	  (smtpmail-read-response process)
	  (delete-process process)
	  (unless smtpmail-debug-info
	    (kill-buffer process-buffer)))))))
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(defun smtpmail-process-filter (process output)
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  (with-current-buffer (process-buffer process)
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    (goto-char (point-max))
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    (insert output)
    (set-marker (process-mark process) (point))))
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(defun smtpmail-read-response (process)
  (let ((case-fold-search nil)
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	(response-strings nil)
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	(response-continue t)
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	(return-value '(nil ()))
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	match-end)
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    (catch 'done
      (while response-continue
	(goto-char smtpmail-read-point)
	(while (not (search-forward "\r\n" nil t))
	  (unless (memq (process-status process) '(open run))
	    (throw 'done nil))
	  (accept-process-output process)
	  (goto-char smtpmail-read-point))

	(setq match-end (point))
	(setq response-strings
	      (cons (buffer-substring smtpmail-read-point (- match-end 2))
		    response-strings))

	(goto-char smtpmail-read-point)
	(if (looking-at "[0-9]+ ")
	    (let ((begin (match-beginning 0))
		  (end (match-end 0)))
	      (if smtpmail-debug-info
		  (message "%s" (car response-strings)))

	      (setq smtpmail-read-point match-end)

	      ;; ignore lines that start with "0"
	      (if (looking-at "0[0-9]+ ")
		  nil
		(setq response-continue nil)
		(setq return-value
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		      (cons (string-to-number
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			     (buffer-substring begin end))
			    (nreverse response-strings)))))

	  (if (looking-at "[0-9]+-")
	      (progn (if smtpmail-debug-info
			 (message "%s" (car response-strings)))
		     (setq smtpmail-read-point match-end)
		     (setq response-continue t))
	    (progn
	      (setq smtpmail-read-point match-end)
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	      (setq response-continue nil)
	      (setq return-value
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		    (cons nil (nreverse response-strings)))))))
      (setq smtpmail-read-point match-end))
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    return-value))


(defun smtpmail-send-command (process command)
  (goto-char (point-max))
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  (if (string-match "\\`AUTH [A-Z]+ " command)
      (insert (match-string 0 command) "<omitted>\r\n")
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    (insert command "\r\n"))
  (setq smtpmail-read-point (point))
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  (process-send-string process (concat command "\r\n")))
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(defun smtpmail-send-data-1 (process data)
  (goto-char (point-max))

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  (if (and (multibyte-string-p data)
	   smtpmail-code-conv-from)
      (setq data (string-as-multibyte
		  (encode-coding-string data smtpmail-code-conv-from))))
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  (if smtpmail-debug-info
      (insert data "\r\n"))

  (setq smtpmail-read-point (point))
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  ;; Escape "." at start of a line
  (if (eq (string-to-char data) ?.)
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      (process-send-string process "."))
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  (process-send-string process data)
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  (process-send-string process "\r\n"))
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(defun smtpmail-send-data (process buffer)
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  (let ((data-continue t) sending-data
        (pr (with-current-buffer buffer
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              (make-progress-reporter "Sending email "
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                                      (point-min) (point-max)))))
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    (with-current-buffer buffer
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      (goto-char (point-min)))
    (while data-continue
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      (with-current-buffer buffer
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        (progress-reporter-update pr (point))
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        (setq sending-data (buffer-substring (point-at-bol) (point-at-eol)))
	(end-of-line 2)
        (setq data-continue (not (eobp))))
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      (smtpmail-send-data-1 process sending-data))
    (progress-reporter-done pr)))
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(defun smtpmail-deduce-address-list (smtpmail-text-buffer header-start header-end)
  "Get address list suitable for smtp RCPT TO: <address>."
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  (unwind-protect
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      (with-current-buffer smtpmail-address-buffer
	(erase-buffer)
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	(let ((case-fold-search t)
              (simple-address-list "")
              this-line
              this-line-end
              addr-regexp)
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	  (insert-buffer-substring smtpmail-text-buffer header-start header-end)
	  (goto-char (point-min))
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	  ;; RESENT-* fields should stop processing of regular fields.
	  (save-excursion
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	    (setq addr-regexp
		  (if (re-search-forward "^Resent-\\(to\\|cc\\|bcc\\):"
					 header-end t)
		      "^Resent-\\(to\\|cc\\|bcc\\):"
		    "^\\(To:\\|Cc:\\|Bcc:\\)")))
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	  (while (re-search-forward addr-regexp header-end t)
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	    (replace-match "")
	    (setq this-line (match-beginning 0))
	    (forward-line 1)
	    ;; get any continuation lines
	    (while (and (looking-at "^[ \t]+") (< (point) header-end))
	      (forward-line 1))
	    (setq this-line-end (point-marker))
	    (setq simple-address-list
		  (concat simple-address-list " "
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			  (mail-strip-quoted-names (buffer-substring this-line this-line-end)))))
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	  (erase-buffer)
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	  (insert " " simple-address-list "\n")
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	  (subst-char-in-region (point-min) (point-max) 10 ?  t) ; newline --> blank
	  (subst-char-in-region (point-min) (point-max) ?, ?  t) ; comma   --> blank
	  (subst-char-in-region (point-min) (point-max)  9 ?  t) ; tab     --> blank
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	  (goto-char (point-min))
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	  ;; tidiness in case hook is not robust when it looks at this
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	  (while (re-search-forward "[ \t]+" header-end t) (replace-match " "))

	  (goto-char (point-min))