bug#23054: 25.1.50; Unqualified recipients are considered bogus by message.el

[Peder O. Klingenberg]

In emacs master as of today, unqualified email addresses are considered
bogus by message-bogus-recipient-p, despite my smarthost being perfectly
happy sending mail to local addresses.  This started with commit 762986c
"Remove message-valid-fqdn-regexp, since it changes too much now" by
Lars Ingebrigtsen at Feb 7.

Restoring local addresses to non-bogus status seems simple enough:

--- a/lisp/gnus/message.el
+++ b/lisp/gnus/message.el
@@ -4345,7 +4345,6 @@ message-bogus-recipient-p
     (mapc (lambda (address)
            (setq address (or (cadr address) ""))
            (when (or (string= "" address)
-                     (not (string-match "@" address))
                      (string-match "@.*@" address)
                      (and message-bogus-addresses
                           (let ((re

Test case, starting from emacs -Q:

After evaluating (require 'message), the following two forms should both
return nil:

(message-bogus-recipient-p "peder@klingenberg.no")
(message-bogus-recipient-p "peder")

With current master, only the first returns nil.




In GNU Emacs 25.1.50.2 (x86_64-unknown-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2016-03-18 built on luna
Repository revision: ace779da01b7ad3130640e945a883f35c0d27330
Windowing system distributor 'The X.Org Foundation', version 11.0.11604000
System Description:     Ubuntu 14.04.4 LTS

Configured using:
 'configure --prefix=/usr/local/emacs-git
 
--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/site-lisp/:/usr/share/emacs/site-lisp
 --with-x=yes --with-x-toolkit=lucid --with-toolkit-scroll-bars
 --with-pop=yes'

Configured features:
XAW3D XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF
GSETTINGS NOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT
ZLIB TOOLKIT_SCROLL_BARS LUCID X11

Important settings:
  value of $LC_MONETARY: en_NO.UTF-8
  value of $LC_NUMERIC: en_NO.UTF-8
  value of $LANG: en_NO.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  magit-auto-revert-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  linum-mode: t
  show-paren-mode: t
  paredit-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Contacting host: lars.ingebrigtsen.no:80
Checking new news...done
nnimap read 0k from tarrant.klingenberg.no
Mark saved where search started [2 times]
Saving file /home/pok/src/emacs/local/lisp/gnus/message.el...
Wrote /home/pok/src/emacs/local/lisp/gnus/message.el
Wrote /home/pok/src/emacs/local/lisp/gnus/message.elc
Loading /home/pok/src/emacs/local/lisp/gnus/message.elc...done
Finding changes in /home/pok/src/emacs/local/lisp/gnus/message.el...done
nil [2 times]

Load-path shadows:
/usr/share/emacs24/site-lisp/latex-cjk-thai/thai-word hides 
/usr/local/emacs-git/share/emacs/25.1.50/lisp/language/thai-word

Features:
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mouse jit-lock font-lock syntax facemenu font-core term/tty-colors frame
cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan thai
tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify
dynamic-setting system-font-setting font-render-setting x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 635042 91703)
 (symbols 48 53663 44)
 (miscs 40 1734 3507)
 (strings 32 144162 24602)
 (string-bytes 1 7911285)
 (vectors 16 79006)
 (vector-slots 8 1909100 73328)
 (floats 8 837 845)
 (intervals 56 7825 9130)
 (buffers 976 69)
 (heap 1024 87016 21105))