#!emacs --script

(require 'message)
(require 'smtpmail)

(setq
 message-sent-message-via '(mail mail)
 message-send-mail-function 'smtpmail-send-it)

(unless (file-exists-p "~/.emailrc")
  (error "Missing ~/.emailrc.  Need the following:
(setq
 smtpmail-smtp-server \"smtp.example.org\"
 user-mail-address \"john.doe@example.org\"
 user-full-name \"John Doe\")"))
(load "~/.emailrc" nil)

(unless (file-exists-p "~/.authinfo.gpg")
  (error (format "Missing ~/.authinfo.gpg.  Need the following:
machine %s login MYLOGIN port 25 password MYPASSWORD" smtpmail-smtp-server)))

(when (< (length command-line-args-left) 2)
  (error (format "Usage: %s SUBJECT TO...

The e-mail body is read from the standard input (stdin)."
                 (file-name-nondirectory (nth 2 command-line-args)))))

(with-temp-buffer
  (insert (format "
From: %s <%s>
To: %s
Subject: %s
--text follows this line--

"
               user-full-name user-mail-address
               (mapconcat 'identity (cdr command-line-args-left) ", ")
               (nth 0 command-line-args-left)))
  (insert (read-from-minibuffer ""))
  (message-send))