GNU bug report logs - #53412
27.1; sendmail does not wrap overlong lines

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From: Francesco Potortì <pot <at> gnu.org>
To: 53412 <at> debbugs.gnu.org
Subject: bug#53412: 27.1; sendmail does not wrap overlong lines
Date: Fri, 21 Jan 2022 16:16:15 +0100

I use sendmail-user-agent (rather than message-user-agent) to send
email.  I have mml-mode in the mail-mode-hook.  When I have overlong
lines (> 1000 characters) Emacs should wrap them, as they are not
allowed in SMTP.  This should be standard behaviour, but it is not.

Digging in the source, I found mm-use-ultra-safe-encoding, which should
do that (among other things).  By the way, its doc string says that long
lines are wrapped to prevent broken email servers from breaking; that's
inaccurate: overlong lines are prohibited.

However I tried to set it, mm-use-ultra-safe-encoding is ignored, I have
not understood how it should be set.  I worked around it by

(add-hook 'mail-send-hook
	  (lambda () (and (mm-long-lines-p 1000)
			  (mml-to-mime)))) ; break overlong lines

but breaking overlong lines should be the normal behaviour, not a user
option to be explicitly activated.




In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2021-11-27, modified by Debian built on x86-csail-01
Windowing system distributor 'The X.Org Foundation', version 11.0.12014000
System Description: Debian GNU/Linux bookworm/sid

Recent messages:
Quit
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Auto-saving...done
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You can run the command ‘mml-validate’ with C-c RET v
Beginning of buffer
scroll-signal-boundary-error: Beginning of buffer
Auto-saving...
Type C-x 1 to delete the help window, C-M-v to scroll help.

Quit
Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --enable-libsystemd --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/27.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils --build
 x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/lib --localstatedir=/var/lib
 --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd
 --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/27.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils --with-x=yes
 --with-x-toolkit=lucid --with-toolkit-scroll-bars --without-gsettings
 'CFLAGS=-g -O2
 -ffile-prefix-map=/build/emacs-fQHadv/emacs-27.1+1=. -fstack-protector-strong
 -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'

Configured features:
XAW3D XPM JPEG TIFF GIF PNG RSVG SOUND GPM DBUS GLIB NOTIFY INOTIFY ACL
LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS LUCID X11 XDBE XIM MODULES THREADS LIBSYSTEMD JSON
PDUMPER LCMS2 GMP

Important settings:
  value of $LC_COLLATE: it_IT.UTF-8
  value of $LC_CTYPE: it_IT.UTF-8
  value of $LC_NUMERIC: C
  value of $LANG: C.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
  desktop-save-mode: t
  epa-global-mail-mode: t
  shell-dirtrack-mode: t
  openwith-mode: t
  xterm-mouse-mode: t
  display-time-mode: t
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-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
  column-number-mode: t
  line-number-mode: t

Load-path shadows:
~/elisp/bhl hides /usr/share/emacs/site-lisp/bhl
/usr/share/emacs/site-lisp/elpa/debian-el-37/debian-autoloads hides /usr/share/emacs/site-lisp/elpa/gnuplot-mode-20141231/debian-autoloads
/usr/share/emacs/site-lisp/elpa/cmake-mode-3.22.1/cmake-mode hides /usr/share/emacs/site-lisp/elpa-src/cmake-mode-3.22.1/cmake-mode
/usr/share/emacs/site-lisp/elpa/cmake-mode-3.22.1/cmake-mode-pkg hides /usr/share/emacs/site-lisp/elpa-src/cmake-mode-3.22.1/cmake-mode-pkg
/usr/share/emacs/site-lisp/elpa/cmake-mode-3.22.1/cmake-mode-autoloads hides /usr/share/emacs/site-lisp/elpa-src/cmake-mode-3.22.1/cmake-mode-autoloads
/usr/share/emacs/site-lisp/elpa/csv-mode-1.18/csv-mode-pkg hides /usr/share/emacs/site-lisp/elpa-src/csv-mode-1.18/csv-mode-pkg
/usr/share/emacs/site-lisp/elpa/csv-mode-1.18/csv-mode hides /usr/share/emacs/site-lisp/elpa-src/csv-mode-1.18/csv-mode
/usr/share/emacs/site-lisp/elpa/csv-mode-1.18/csv-mode-tests hides /usr/share/emacs/site-lisp/elpa-src/csv-mode-1.18/csv-mode-tests
/usr/share/emacs/site-lisp/elpa/csv-mode-1.18/csv-mode-autoloads hides /usr/share/emacs/site-lisp/elpa-src/csv-mode-1.18/csv-mode-autoloads
/usr/share/emacs/site-lisp/elpa/debian-el-37/debian-el hides /usr/share/emacs/site-lisp/elpa-src/debian-el-37/debian-el
/usr/share/emacs/site-lisp/elpa/debian-el-37/gnus-BTS hides /usr/share/emacs/site-lisp/elpa-src/debian-el-37/gnus-BTS
/usr/share/emacs/site-lisp/elpa/debian-el-37/preseed hides /usr/share/emacs/site-lisp/elpa-src/debian-el-37/preseed
/usr/share/emacs/site-lisp/elpa/debian-el-37/deb-view hides /usr/share/emacs/site-lisp/elpa-src/debian-el-37/deb-view
/usr/share/emacs/site-lisp/elpa/debian-el-37/debian-el-autoloads hides /usr/share/emacs/site-lisp/elpa-src/debian-el-37/debian-el-autoloads
/usr/share/emacs/site-lisp/elpa/debian-el-37/apt-utils hides /usr/share/emacs/site-lisp/elpa-src/debian-el-37/apt-utils
/usr/share/emacs/site-lisp/elpa/debian-el-37/debian-bug hides /usr/share/emacs/site-lisp/elpa-src/debian-el-37/debian-bug
/usr/share/emacs/site-lisp/elpa/debian-el-37/debian-el-pkg hides /usr/share/emacs/site-lisp/elpa-src/debian-el-37/debian-el-pkg
/usr/share/emacs/site-lisp/elpa/debian-el-37/apt-sources hides /usr/share/emacs/site-lisp/elpa-src/debian-el-37/apt-sources
/usr/share/emacs/site-lisp/elpa/debian-el-37/debian-autoloads hides /usr/share/emacs/site-lisp/elpa-src/debian-el-37/debian-autoloads
/usr/share/emacs/site-lisp/elpa/dictionary-1.10/dictionary hides /usr/share/emacs/site-lisp/elpa-src/dictionary-1.10/dictionary
/usr/share/emacs/site-lisp/elpa/dictionary-1.10/link hides /usr/share/emacs/site-lisp/elpa-src/dictionary-1.10/link
/usr/share/emacs/site-lisp/elpa/dictionary-1.10/dictionary-pkg hides /usr/share/emacs/site-lisp/elpa-src/dictionary-1.10/dictionary-pkg
/usr/share/emacs/site-lisp/elpa/dictionary-1.10/dictionary-autoloads hides /usr/share/emacs/site-lisp/elpa-src/dictionary-1.10/dictionary-autoloads
/usr/share/emacs/site-lisp/elpa/dictionary-1.10/connection hides /usr/share/emacs/site-lisp/elpa-src/dictionary-1.10/connection
/usr/share/emacs/site-lisp/elpa/gnuplot-mode-20141231/gnuplot hides /usr/share/emacs/site-lisp/elpa-src/gnuplot-mode-20141231/gnuplot
/usr/share/emacs/site-lisp/elpa/gnuplot-mode-20141231/gnuplot-mode-pkg hides /usr/share/emacs/site-lisp/elpa-src/gnuplot-mode-20141231/gnuplot-mode-pkg
/usr/share/emacs/site-lisp/elpa/debian-el-37/debian-autoloads hides /usr/share/emacs/site-lisp/elpa-src/gnuplot-mode-20141231/debian-autoloads
/usr/share/emacs/site-lisp/elpa/gnuplot-mode-20141231/gnuplot-context hides /usr/share/emacs/site-lisp/elpa-src/gnuplot-mode-20141231/gnuplot-context
/usr/share/emacs/site-lisp/elpa/gnuplot-mode-20141231/gnuplot-gui hides /usr/share/emacs/site-lisp/elpa-src/gnuplot-mode-20141231/gnuplot-gui
/usr/share/emacs/site-lisp/elpa/gnuplot-mode-20141231/gnuplot-mode-autoloads hides /usr/share/emacs/site-lisp/elpa-src/gnuplot-mode-20141231/gnuplot-mode-autoloads
/usr/share/emacs/site-lisp/elpa/markdown-mode-2.4/markdown-mode-autoloads hides /usr/share/emacs/site-lisp/elpa-src/markdown-mode-2.4/markdown-mode-autoloads
/usr/share/emacs/site-lisp/elpa/markdown-mode-2.4/markdown-mode hides /usr/share/emacs/site-lisp/elpa-src/markdown-mode-2.4/markdown-mode
/usr/share/emacs/site-lisp/elpa/markdown-mode-2.4/markdown-mode-pkg hides /usr/share/emacs/site-lisp/elpa-src/markdown-mode-2.4/markdown-mode-pkg
~/elisp/bibtex hides /usr/share/emacs/27.1/lisp/textmodes/bibtex
~/elisp/octave hides /usr/share/emacs/27.1/lisp/progmodes/octave
/usr/share/emacs/site-lisp/flim/sasl hides /usr/share/emacs/27.1/lisp/net/sasl

Features:
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shr url-cookie url-domsuf url-util svg xml js imenu sgml-mode dom bibtex
generic sh-script executable make-mode gud bug-reference cc-mode
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color noutline outline easy-mmode desktop frameset pot skeleton rmailsum
rmail rmail-loaddefs w3m mailcap doc-view image-mode exif timezone
w3m-hist w3m-fb bookmark-w3m w3m-ems wid-edit w3m-favicon w3m-image
tab-line w3m-proc w3m-util ffap thingatpt ange-ftp sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr epa-mail mail-utils epa derived
epg epg-config view mule-util holidays hol-loaddefs appt diary-lib
diary-loaddefs cal-menu calendar cal-loaddefs tramp tramp-loaddefs
trampver tramp-integration files-x tramp-compat shell pcomplete comint
ring parse-time iso8601 time-date ls-lisp format-spec bhl
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Memory information:
((conses 16 717143 274029)
 (symbols 48 42375 1)
 (strings 32 201218 11566)
 (string-bytes 1 5486048)
 (vectors 16 54011)
 (vector-slots 8 1886696 294498)
 (floats 8 735 643)
 (intervals 56 114279 81)
 (buffers 1000 172))

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