:PROPERTIES:
:TOC:      :include all :depth 3
:END:
#+TITLE: Mail
#+PROPERTY: header-args :mkdirp yes
#+PROPERTY: header-args:conf-unix   :comments link
#+PROPERTY: header-args:bash           :tangle-mode (identity #o755) :comments link :shebang "#!/usr/bin/env bash"

My email configuration with [[https://notmuchmail.org/][notmuch]] + [[https://github.com/gauteh/lieer][lieer]] + [[https://marlam.de/msmtp/][msmtp]]. My problem with any particular mail setup was that I use Gmail labels quite extensively, and handling these over IMAP is rather awkward. Hence this choice of software.

References:
- [[https://sqrtminusone.xyz/posts/2021-02-27-gmail/][My post]] about email configuration. I wrote it some time ago, but the general idea remains.


* Contents
:PROPERTIES:
:TOC:      :include all
:END:
:CONTENTS:
- [[#contents][Contents]]
- [[#lieer][Lieer]]
- [[#notmuch][Notmuch]]
  - [[#config][Config]]
  - [[#hooks][Hooks]]
    - [[#pre_new][pre_new]]
    - [[#post_new][post_new]]
- [[#sync-script][Sync script]]
- [[#mstp][MSTP]]
- [[#emacs][Emacs]]
- [[#mailcap][mailcap]]
- [[#guix-settings][Guix settings]]
:END:

* Lieer
| Guix dependency |
|-----------------|
| python-lieer    |

Lieer is a program to link up Gmail and notmuch. Basically, it downloads mail from Gmail via API, stores them in Maildir, and synchronizes labels with notmuch.

I have a separate directory in my =~/Mail= for each address. To init lieer, run the following command in the directory:
#+begin_example
gmi init <address>
#+end_example

After which the settings will be stored in =gmailieer.json= and the credentials in =.credentials.gmailieer.json=. The latter file is stored encrypted.

My preferred settings:
#+begin_example
gmi set --replace-slash-with-dot
gmi set --ignore-tags-local new
#+end_example

Running =gmi sync= in the required directory performs the synchronization. The first sync takes a while, the subsequent syncs are pretty fast.
* Notmuch
| Guix dependency |
|-----------------|
| notmuch         |
| parallel        |

Notmuch is an email indexer program, which handles labels in a way somewhat like Gmail. It also provides a frontend for Emacs, but it's not the only one available.

** Config
:PROPERTIES:
:header-args+: :tangle ~/.notmuch-config
:END:

Not much is going on here.

First, the database path.
#+begin_src conf-unix
[database]
path=/home/pavel/Mail
#+end_src

My name and list of emails. It's not like it's a secret anyhow.
#+begin_src conf-unix
[user]
name=Pavel Korytov
primary_email=thexcloud@gmail.com
other_email=progin6304@gmail.com;
#+end_src

A list of tags which will be added by =notmuch new= and directory names which will be ignored by =notmuch new=.

#+begin_src conf-unix
[new]
tags=new;
ignore=.osync_workdir
#+end_src

Exclude these tags from search by default.
#+begin_src conf-unix
[search]
exclude_tags=trash;spam;
#+end_src

Maildir compatibility.
#+begin_src conf-unix
[maildir]
synchronize_flags=true
#+end_src

** Hooks
Now, we have to link up lieer and notmuch. This is done via the notmuch hook system, which allows to run custom scripts before and after any command.

*** =pre_new=
This hook runs fetch from Gmail in parallel before the =notmuch new= command.

The =parallel= command is provided by [[https://www.gnu.org/software/parallel/][GNU Parallel]].

#+begin_src bash :tangle ~/Mail/.notmuch/hooks/pre-new
# GMI="/home/pavel/Programs/miniconda3/envs/mail/bin/gmi"
GMI="gmi"
parallel -j0 "(cd /home/pavel/Mail/{}/ && $GMI sync)" ::: thexcloud progin6304
#+end_src
*** =post_new=
And this hook tags different mailboxes with different tags.

#+begin_src bash :tangle ~/Mail/.notmuch/hooks/post-new
notmuch tag +main "path:thexcloud/** AND tag:new"
notmuch tag +progin "path:progin6304/** AND tag:new"
notmuch tag -new "tag:new"
#+end_src
* Sync script
A script to run =notmuch new= and push a notification if there is new mail.

#+begin_src bash :tangle ~/bin/scripts/check-email
export DISPLAY=:0
CHECK_FILE="/home/pavel/Mail/.last_check"
QUERY="tag:unread"
ALL_QUERY="tag:unread"
if [ -f "$CHECK_FILE" ]; then
    DATE=$(cat "$CHECK_FILE")
    QUERY="$QUERY and date:@$DATE.."
fi

notmuch new
NEW_UNREAD=$(notmuch count "$QUERY")
ALL_UNREAD=$(notmuch count "$ALL_QUERY")

if [ $NEW_UNREAD -gt 0 ]; then
    MAIN_UNREAD=$(notmuch count "tag:unread AND tag:main")
    PROGIN_UNREAD=$(notmuch count "tag:unread AND tag:progin")
    read -r -d '' NOTIFICATION <<EOM
$NEW_UNREAD new messages
$MAIN_UNREAD thexcloud@gmail.com
$PROGIN_UNREAD progin6304@gmail.com
$ALL_UNREAD total
EOM
    notify-send "New Mail" "$NOTIFICATION"
fi

echo "$(date +%s)" > $CHECK_FILE
#+end_src

The script is ran via GNU Mcron every 5 minutes.
#+begin_src scheme :tangle ~/.config/cron/mail.guile
(job "*/5 * * * * " "~/bin/scripts/check-email")
#+end_src
* MSTP
| Guix dependency |
|-----------------|
| msmtp           |

Sending emails can be done with MSMTP. It automatially chooses the email address and server based on the contents of the message, which is handy if there are multiple mailboxes to be managed.

As I haven't encrypted my passwords properly yet, I encrypt the entire configuration file.
* Emacs
:PROPERTIES:
:header-args+: :tangle ~/.emacs.d/mail.el
:END:
Finally, Emacs configuration.

The problem with my Guix setup is that Emacs by default doesn't see the elisp files of notmuch, so here is a small workaround:
#+begin_src emacs-lisp
(let ((default-directory  "/home/pavel/.guix-extra-profiles/mail/mail/share/emacs/site-lisp"))
  (normal-top-level-add-subdirs-to-load-path))

(my-leader-def "am" 'notmuch)
#+end_src

And the proper notmuch settings:
#+begin_src emacs-lisp
(use-package notmuch
  ;; :ensure nil
  :commands (notmuch)
  :config
  (setq mail-specify-envelope-from t)
  (setq message-sendmail-envelope-from 'header)
  (setq mail-envelope-from 'header)
  (setq notmuch-always-prompt-for-sender t)
  (setq sendmail-program (executable-find "msmtp"))
  (setq send-mail-function #'sendmail-send-it)
  (setq mml-secure-openpgp-sign-with-sender t)
  (add-hook 'notmuch-hello-mode-hook
            (lambda () (display-line-numbers-mode 0)))
  (setq notmuch-saved-searches
        '((:name "inbox (main)" :query "tag:inbox AND tag:main")
          (:name "unread (main)" :query "tag:unread AND tag:main")
          (:name "sent (main)" :query "tag:sent AND tag:main")
          (:name "all mail (main)" :query "tag:main")
          (:name "inbox (progin)" :query "tag:inbox AND tag:progin")
          (:name "unread (progin)" :query "tag:unread AND tag:progin")
          (:name "sent (progin)" :query "tag:sent AND tag:progin")
          (:name "all main (progin)" :query "tag:progin")
          (:name "drafts" :query "tag:draft")))
  (custom-set-faces
   `(notmuch-wash-cited-text ((t (:foreground ,(doom-color 'yellow)))))))
#+end_src

The file to which this is tangled is read in the init.el.

** Signing messages
#+begin_src emacs-lisp
(with-eval-after-load 'notmuch
  (add-hook 'message-setup-hook 'mml-secure-sign-pgpmime))

(setq mml-secure-key-preferences
      '((OpenPGP
         (sign
          ("thexcloud@gmail.com" "914472A1FD6775C166F96EBEED739ADF81C78160"))
         (encrypt))
        (CMS
         (sign)
         (encrypt))))
#+end_src
* mailcap
mailcap file is a file which defines how to read to different MIME types. Notmuch also uses it, so why not keep it here.

#+begin_src text :tangle ~/.mailcap
audio/*; mpc add %s

image/*; feh %s

application/msword; /usr/bin/xdg-open %s
application/pdf; zathura %s
application/postscript ; zathura %s

text/html; firefox %s
#+end_src
* Guix settings
#+NAME: packages
#+begin_src emacs-lisp :tangle no
(my/format-guix-dependencies)
#+end_src

#+begin_src scheme :tangle .config/guix/manifests/mail.scm :noweb yes
(specifications->manifest
 '(
   <<packages()>>))
#+end_src