Displaying the attached email with MH-E (using "emacs -Q") or Gnus leads
to a hang in shr (CPU is pegged, I waited for 5 minutes before giving
up).  The HTML looks pretty gnarly, but Emacs 25.3 displays the message
just fine, with maybe a pause of a couple seconds.

In GNU Emacs 26.0.90 (build 2, x86_64-pc-linux-gnu, X toolkit, Xaw scroll bars)
 of 2017-10-27 built on alto
Repository revision: 50f711e7fab149d11da8c5caa61ee0b5e6c89bf1
Windowing system distributor 'The X.Org Foundation', version 11.0.11604000
System Description:	Debian GNU/Linux 8.9 (jessie)

Recent messages:
Auto-saving...done
Scanning +inbox...done
Quit
Mark set
Mark saved where search started
Mark set
No more undeleted messages
Processing deletes and refiles for +inbox...done
Auto-saving...done
Making completion list...

Configured using:
 'configure --prefix=/usr/new'

Configured features:
XPM JPEG TIFF GIF PNG SOUND NOTIFY GNUTLS LIBXML2 FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS LUCID X11

Important settings:
  value of $LC_TIME: C
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8-unix

Major mode: MH-Folder

Minor modes in effect:
  diff-auto-refine-mode: t
  hl-line-mode: t
  shell-dirtrack-mode: t
  delete-selection-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
  buffer-read-only: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow emacsbug mh-funcs gnus-draft mh-thread nnir dired-aux diff-mode
gnus-mh mh-identity mh-letter mh-comp gnus-html cus-theme eieio-custom
wid-browse tree-widget help-fns radix-tree cus-edit cus-start cus-load
flow-fill grep compile dired-x mh-alias crm cl-print debug mh-mime
mh-gnus diary-lib diary-loaddefs cal-move info pp shr-color sort
mail-extr gnus-async gnus-bcklg misearch multi-isearch qp gnus-kill
cursor-sensor mhtml-mode css-mode smie color eww url-queue shr svg
browse-url js json map sgml-mode dom flyspell ispell gnus-ml disp-table
mm-archive url-http url-gw url-cache url-auth url-handlers nnrss xml
mm-url url url-proxy url-privacy url-expand url-methods url-history
url-cookie url-domsuf url-util url-parse url-vars nndoc nndraft nnmh
network-stream nsm starttls gnus-agent gnus-srvr gnus-score score-mode
nnvirtual gnus-msg nntp gnus-cache mh-show goto-addr thingatpt gnus-cite
gnus-art mm-uu mml2015 mm-view mml-smime smime dig mailcap gnus-sum
gnus-group gnus-undo gnus-start gnus-cloud nnimap nnmail mail-source tls
gnutls utf7 netrc nnoo parse-time gnus-spec gnus-int gnus-win gnus-range
gnus nnheader wid-edit mh-inc hl-line mh-tool-bar mh-seq mh-xface
mh-utils mdk-mail smtpmail auth-source eieio eieio-core cl-macs
eieio-loaddefs sendmail message rmc puny seq byte-opt gv bytecomp
byte-compile cconv rfc822 mml mml-sec password-cache epa derived epg
epg-config mm-decode mm-bodies mm-encode mail-parse rfc2231 gmm-utils
mailheader mh-folder which-func imenu mh-scan mh-e mh-compat mailabbrev
mh-buffers mh-loaddefs vc-hg cl-extra help-mode org-rmail org-mhe
org-irc org-info org-gnus gnus-util rmail rmail-loaddefs rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mail-utils org-docview doc-view jka-compr
image-mode dired dired-loaddefs org-bibtex bibtex org-bbdb org-w3m
org-element cl-seq avl-tree generator org org-macro org-footnote
org-pcomplete org-list org-faces org-entities org-version ob-emacs-lisp
ob ob-tangle org-src ob-ref ob-lob ob-table ob-keys ob-exp ob-comint
ob-core ob-eval org-compat org-macs org-loaddefs format-spec find-func
cal-menu calendar cal-loaddefs elec-pair server noutline outline
easy-mmode cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align
cc-engine cc-vars cc-defs shell pcomplete comint ansi-color ring xcscope
easymenu advice delsel vc cl-loaddefs cl-lib vc-dispatcher timeclock
mdk-hacks time-date mule-util tooltip eldoc electric uniquify ediff-hook
vc-hooks lisp-float-type mwheel term/x-win x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow isearch timer select scroll-bar 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 composite charscript charprop
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 inotify dynamic-setting
font-render-setting x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 618925 173854)
 (symbols 48 47553 20)
 (miscs 40 894 1526)
 (strings 32 131114 29559)
 (string-bytes 1 6012527)
 (vectors 16 55934)
 (vector-slots 8 1841037 152694)
 (floats 8 559 704)
 (intervals 56 102368 2278)
 (buffers 992 123)
 (heap 1024 79393 50480))