bug#31145: 27.0.50; forwarding an html email in gnus mungs the headers if they contain a blank line

[Robert Marshall]

In gnus I C-c C-f'ed an email with multiple mimeparts one of which is
html.
That email also contains a blank line with the headers

------- header section
X-Spam-Report: Content analysis details: (2.2 points)
 
  pts rule name              description

------- end of extract but more lines of headers followed

When the user received the forward those headers read:

X-Spam-Report: Content analysis details: (2.2 points)
--=====-=-=
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="=====-=-="

 
  pts rule name              description

Looks like some part of the forwarding interpreted the blank line as the
end of the headers?
If necessary I can - off list - forward an email of both the original
and the corrupted forward.

Robert


In GNU Emacs 27.0.50 (build 9, x86_64-pc-linux-gnu, GTK+ Version 2.24.31)
 of 2018-03-09 built on ct-lt-579
Repository revision: 80e145fc96765cc0a0f48ae2425294c8c92bce56
Windowing system distributor 'The X.Org Foundation', version 11.0.11902000
System Description: Debian GNU/Linux 9 (stretch)

Recent messages:
Sending via mail...
Sending email 
Sending email done
Sending...done
Checking new news...
Reading active file via nndraft...done
Checking new news...done
2:Codethink:INBOX
nnimap read 0k from mail.codethink.co.uk
Auto-saving...done

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS NOTIFY
GNUTLS LIBXML2 FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK2 X11 THREADS
LCMS2

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

Major mode: Article

Minor modes in effect:
  magit-auto-revert-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  gnus-desktop-notify-mode: t
  diff-auto-refine-mode: t
  desktop-save-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/robertmarshall/elisp/bbdb/lisp/bbdb hides 
/home/robertmarshall/.emacs.d/elpa/bbdb-20170725.300/bbdb
<snip>

Features:
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base64 format env code-pages mule custom widget hashtable-print-readable
backquote dbusbind inotify lcms2 dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
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