:PROPERTIES:
:TOC:      :include all :depth 3
:END:
#+TITLE: Mail
#+PROPERTY: header-args :mkdirp yes
#+PROPERTY: header-args:emacs-lisp  :eval never-export
#+PROPERTY: header-args:conf-unix   :comments link
#+PROPERTY: header-args:conf-space  :comments link
#+PROPERTY: header-args:bash        :tangle-mode (identity #o755) :comments link :shebang "#!/usr/bin/env bash"
#+OPTIONS: broken-links:auto h:6 toc:nil

My email configration. Currently I use [[https://github.com/gauteh/lieer][lieer]] to fetch emails from Gmail, [[http://davmail.sourceforge.net/][davmail]] & [[http://www.offlineimap.org/][offlineimap]] to fetch emails from MS Exchange, [[https://notmuchmail.org/][notmuch]] to index, [[https://marlam.de/msmtp/][msmtp]] to send emails. Also using notmuch frontend from Emacs.

My problem with any particular mail setup was that I use Gmail labels quite extensively, and handling these over IMAP is rather awkward. Notmuch seems to be the only software that provides the same first-class support for labels.

But I also have an Exchange account, with which I communicate via IMAP/SMTP adapter, and in this case, I synchronize notmuch tags and IMAP folders.

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.

* 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.
* DavMail
[[davmail.sourceforge.net][DavMail]] is a gateway between MS Exchange and the rest of the world, which uses IMAP/SMTP/LDAP/etc. As I have one corporate MS Exchange address, this is just the program I need. As of yet, it isn't packaged for Guix, but it's easy enough to download.

It has a GUI mode, but I prefer headless config.
#+begin_src conf-unix :tangle ~/bin/davmail-6.0.0-3375/davmail.properties
davmail.server=true
davmail.mode=Auto
davmail.url=https://mail.etu.ru/owa/

davmail.server.certificate.hash=0C:9E:CF:D3:62:26:DB:FA:F1:EE:36:9D:60:E7:31:71:CF:1F:92:85

davmail.caldavPort=1080
davmail.imapPort=1143
davmail.ldapPort=1389
davmail.popPort=1110
davmail.smtpPort=1025

davmail.imapAutoExpunge=false
davmail.enableKeepalive=false
#+end_src

Also it's a bit of problem to get it launched as it looks for its jars in the pwd, so here is a script.
#+begin_src bash :tangle ~/bin/davmail
cd $HOME/bin/davmail-6.0.0-3375
./davmail davmail.properties
#+end_src

Shepherd service is defined in [[file:Desktop.org::*Davmail][Desktop.org]].
* OfflineIMAP
| Guix dependency |
|-----------------|
| offlineimap     |

[[https://github.com/OfflineIMAP/offlineimap][OfflineIMAP]] is a program that can synchronize IMAP mailbox and Maildir. Lieer does everything by itself, but my pirate Exchange IMAP needs this program. There is also [[https://isync.sourceforge.io/][isync]], but there I had some weird issues with duplicate UIDs, which don't occur for OfflineIMAP.

I have a few options for setting a username and password. First, I can run =pass= in =remotepasswordeval=, and while this will work, it will keep my keyring unlocked because I want to run =offlineimap= every couple of minutes.

Another option is to use noweb and not push the file below to the version control. Then I have a plaintext password of email on my computer, but I think it's a lesser evil than the entire keyring.

I would use =password-store-get= from password-store.el, but I want this to be able to run without any 3rd party packages, so it's just bash.

#+NAME: mail-username
#+begin_src bash
pass show Job/Digital/Email/pvkorytov@etu.ru | sed -n 's/username: //;2p'
#+end_src

#+RESULTS: mail-username
: pvkorytov

#+NAME: mail-password
#+begin_src bash
pass show Job/Digital/Email/pvkorytov@etu.ru | head -n 1
#+end_src

#+begin_src conf-unix :tangle ~/.offlineimaprc :noweb yes
[general]
accounts = pvkorytov

[Account pvkorytov]
localrepository = pvkorytov-local
remoterepository = pvkorytov-remote

[Repository pvkorytov-local]
type = Maildir
localfolders = ~/Mail/pvkorytov_etu/

[Repository pvkorytov-remote]
type = IMAP
remotehost = localhost
remoteuser = <<mail-username()>>
remotepass = <<mail-password()>>
remoteport = 1143
starttls = no
ssl = no
sslcacertfile = /etc/ssl/certs/ca-certificates.crt
#+end_src
* Notmuch
| Guix dependency |
|-----------------|
| notmuch         |
| parallel        |

Notmuch is an email indexer program, which handles labels in a way somewhat similar to 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;pvkorytov@etu.ru
#+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;.mbsyncstate;.uidvalidity;.lock;/.*gmailieer\.json.*/
#+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 & davmail's maildir and with notmuch. This is done via the notmuch hook system, which allows running custom scripts before and after any command.

With lieer and Gmail, it is enough to simply run the program, because Gmail has first-class support for tags. Maildir does not, so I decide to synchronize notmuch tags and IMAP folders. In essence, the idea is to:
- move emails to their folders by tags /before/ the synchronization
- tag mails by their folders /after/ the synchronization

The problem is that with that approach one email can have only one tag, but it's better than nothing.

So, here are the rules which match tags & folders:
#+NAME: pvkorytov_tags
| tag                      | folder                   |
|--------------------------+--------------------------|
| inbox                    | INBOX                    |
| sent                     | Sent                     |
| spam                     | Junk                     |
| trash                    | Trash                    |
| job.digital              | Job_Digital              |
| job.digital.docs         | Job_Digital.Docs         |
| job.digital.support      | Job_Digital.Support      |
| job.digital.superservice | Job_Digital.Superservice |
| job.digital.applicants   | Job_Digital.Applicants   |
| job.moevm                | Job_Moevm                |
| etu                      | Etu                      |

And below is a noweb function, which generates the following commands for notmuch to execute:
- /before/ sync:
  - =notmuch search --output files "NOT path:[PATH] AND tag:[TAG] AND tag:[ROOT_TAG]" | xargs -I ! mv ! [PATH]=
    Move emails with =TAG= but outside the matching =PATH= to the latter
  - =notmuch search --output=files "NOT path:[ARCHIVE_PATH] AND tag:[ROOT_TAG] AND NOT tag:[TAG1] ... AND NOT tag:[TAGN]" | xargs -I ! mv ! [ARCHIVE_PATH]=
    Move untagged emails to the =ARCHIVE_PATH=
- /after/ sync:
  - =notmuch tag +[TAG] "path:[PATH] AND NOT tag:[TAG]"=
    Tag emails in =PATH= which do not yet have the matching =TAG=
  - =notmuch tag -[TAG] "NOT path:[PATH] AND tag:[TAG] AND tag:[ROOT_TAG]"=
    Remove =TAG= from emails which are outside the matching =PATH=

These rules are getting included in the respective hooks.

#+NAME: mail-tags
#+begin_src emacs-lisp :var tags=pvkorytov_tags root="pvkorytov_etu" root_tag="pvkorytov" make_tag="" remove="" move="" archive_root=""
(setq my/maildir-root "~/Mail")

(let ((rules '()))
  (dolist (row tags)
    (let ((tag (nth 0 row))
          (folder (nth 1 row)))
      (unless (string-empty-p make_tag)
        (add-to-list
         'rules
         (format "notmuch tag +%s \"path:%s/%s/cur/** AND NOT tag:%s\""
                 tag root folder tag)
         t))
      (unless (string-empty-p remove)
        (add-to-list
         'rules
         (format "notmuch tag -%s \"NOT path:%s/%s/cur/** AND tag:%s AND tag:%s\""
                 tag root folder tag root_tag)
         t))
      (unless (string-empty-p move)
        (add-to-list
         'rules
         (concat
          (format "notmuch search --output=files \"NOT path:%s/%s/cur/** AND tag:%s AND tag:%s\""
                  root folder tag root_tag)
          (format " | xargs -I ! mv ! %s/%s/%s/cur/" my/maildir-root root folder))
         t))))
  (unless (string-empty-p archive_root)
    (add-to-list
     'rules
     (concat
      (format "notmuch search --output=files \"NOT path:%s/%s/cur/** AND %s AND tag:%s\""
              root archive_root
              (mapconcat
               (lambda (row)
                 (format "NOT tag:%s" (car row)))
               tags
               " AND ")
              root_tag)
      (format " | xargs -I ! mv ! %s/%s/%s/cur/" my/maildir-root root archive_root))
     t))
  (string-join rules "\n"))
#+end_src

*** =pre_new=
This hook runs fetch from Gmail & offlineimap in parallel before the =notmuch new= command. The =parallel= command is provided by [[https://www.gnu.org/software/parallel/][GNU Parallel]].

It isn't necessary to run =cd= for offlineimap, but it's easier to write that way.

#+NAME: pre-new-pvkorytov-tags
#+begin_src emacs-lisp :var tags=pvkorytov_tags
(my/mail-format-tags-rules tags "pvkorytov_etu" "pvkorytov" nil nil t "Archive")
#+end_src

#+begin_src bash :tangle ~/Mail/.notmuch/hooks/pre-new :noweb yes
# GMI="/home/pavel/Programs/miniconda3/envs/mail/bin/gmi"
GMI="gmi"

echo "Running pre-new filters"
<<mail-tags(move="t",archive_root="Archive")>>
echo "Pre-new filters done"

parallel --link -j0 "(cd /home/pavel/Mail/{1}/ && {2} {3})" ::: thexcloud progin6304 pvkorytov_etu ::: "$GMI" "$GMI" "offlineimap" ::: sync sync ""
#+end_src

*** =post_new=
And this hook tags different mailboxes with different tags.

#+NAME: post-new-pvkorytov-tags
#+begin_src emacs-lisp :var tags=pvkorytov_tags
(my/mail-format-tags-rules tags "pvkorytov_etu" "pvkorytov" t t)
#+end_src

#+begin_src bash :tangle ~/Mail/.notmuch/hooks/post-new :noweb yes
notmuch tag +main "path:thexcloud/** AND tag:new"
notmuch tag +progin "path:progin6304/** AND tag:new"
notmuch tag +pvkorytov "path:pvkorytov_etu/** AND tag:new"

echo "Running post-new filters"
<<mail-tags(make_tag="t",remove="t")>>
echo "Post-new filters done"
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=$(notmuch count "tag:unread AND tag:progin")
    ETU_UNREAD=$(notmuch count "tag:unread AND tag:pvkorytov")
    read -r -d '' NOTIFICATION <<EOM
$NEW_UNREAD new messages
$MAIN_UNREAD thexcloud@gmail.com
$PROGIN_UNREAD progin6304@gmail.com
$ETU_UNREAD pvkorytov@etu.ru
$ALL_UNREAD total
EOM
    notify-send "New Mail" "$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
* MSMTP
| 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.

#+begin_src conf-space :tangle ~/.msmtprc
defaults
auth on
tls on
tls_trust_file /etc/ssl/certs/ca-certificates.crt
logfile ~/.msmtp.log

account main
host smtp.gmail.com
port 587
from thexcloud@gmail.com
user thexcloud@gmail.com
passwordeval "pass show My_Online/APIs/google-main-app-password | head -n 1"

account progin
host smtp.gmail.com
port 587
from progin6304@gmail.com
user progin6304@gmail.com
passwordeval "pass show My_Online/ETU/progin6304@gmail.com | head -n 1"

account pvkorytov
tls off
auth plain
host localhost
port 1025
from pvkorytov@etu.ru
user pvkorytov
passwordeval "pass show Job/Digital/Email/pvkorytov@etu.ru | head -n 1"
#+end_src
* Emacs
:PROPERTIES:
:header-args+: :tangle ~/.emacs.d/mail.el
:END:

| Guix dependency |
|-----------------|
| emacs-notmuch   |

Finally, Emacs configuration. Let's start with some variables:
#+begin_src emacs-lisp
(setq user-mail-address "thexcloud@gmail.com")
(setq user-full-name "Pavel Korytov")
#+end_src

Then, 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))
#+end_src

Some functions to toggle tags:
#+begin_src emacs-lisp
(defun my/notmuch-toggle-trash ()
  (interactive)
  (evil-collection-notmuch-toggle-tag "trash" "search" #'ignore))

(defun my/notmuch-toggle-inbox ()
  (interactive)
  (evil-collection-notmuch-toggle-tag "inbox" "search" #'ignore))

(defun my/notmuch-toggle-unread ()
  (interactive)
  (evil-collection-notmuch-toggle-tag "unread" "search" #'ignore))
#+end_src

And notmuch settings:
#+begin_src emacs-lisp
(use-package notmuch
  ;; :ensure nil
  :commands (notmuch notmuch-search)
  :init
  (my/use-colors
   (notmuch-wash-cited-text :foreground (doom-color 'yellow)))
  :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 message-send-mail-function #'message-send-mail-with-sendmail)
  (setq sendmail-program (executable-find "msmtp"))
  (setq send-mail-function #'sendmail-send-it)
  (setq mml-secure-openpgp-sign-with-sender t)
  (setq notmuch-mua-user-agent-function 'notmuch-mua-user-agent-full)
  (general-define-key
   :keymaps 'notmuch-search-mode-map
   :states '(normal)
   "d" #'my/notmuch-toggle-trash
   "i" #'my/notmuch-toggle-inbox
   "u" #'my/notmuch-toggle-unread)
  ;; Use org-contacts for completion
  (require 'org-contacts)
  (setq notmuch-address-command 'as-is)
  (add-hook 'notmuch-hello-mode-hook
            (lambda () (display-line-numbers-mode 0))))
#+end_src

The file is read in =init.el=.

** Keybindings
I used to have a more complicated keybinding system here, but that seemed to go against the Dao.

Root keybindings:
#+begin_src emacs-lisp
(my-leader-def
  "am" (my/command-in-persp "notmuch" "mail" 0 (notmuch)))
#+end_src

#+begin_src emacs-lisp
(my/persp-add-rule
  notmuch-hello-mode 0 "mail"
  notmuch-search-mode 0 "mail"
  notmuch-tree-mode 0 "mail"
  notmuch-message-mode 0 "mail")
#+end_src

#+NAME: root_tags
| Root tag  | Prefix | Keybinding description |
|-----------+--------+------------------------|
| main      | m      | thexcloud@gmail.com    |
| progin    | p      | progin6304@gmail.com   |
| pvkorytov | v      | pvkorytov@etu.ru       |

#+NAME: filter_tags
| Tag    | Prefix | Name     |
|--------+--------+----------|
| inbox  | i      | inbox    |
| unread | u      | unread   |
| sent   | s      | sent     |
|        | a      | all mail |

The following formats the tables above to a proper syntax for =setq notmuch-saved-searches=:
#+NAME: format-notmuch-saved-searches
#+begin_src emacs-lisp :var root_tags=root_tags filter_tags=filter_tags :tangle no
(let ((searches '()))
  (dolist (root_tag root_tags)
    (dolist (tag filter_tags)
      (add-to-list
       'searches
       (format "(:name \"%s\" :query \"%s\" :key \"%s\")"
               (format "%s (%s)"
                       (nth 0 root_tag)
                       (nth 2 tag))
               (concat "tag:" (nth 0 root_tag)
                       (unless (string-empty-p (nth 0 tag))
                         (concat " AND tag:" (nth 0 tag))))
               (concat (nth 1 root_tag) (nth 1 tag)))
       t)))
  (string-join searches "\n"))
#+end_src

#+begin_src emacs-lisp :noweb yes
(setq notmuch-saved-searches
      '((:name "drafts" :query "tag:draft" :key "d")
        <<format-notmuch-saved-searches()>>))
#+end_src

#+begin_src emacs-lisp
(general-define-key
 :states '(normal visual)
 :keymaps '(notmuch-hello-mode-map)
 "f" #'notmuch-jump-search)
#+end_src
** 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
** Tuning signature
By default, =message.el= inserts the signature at the bottom of the message, like this:

#+begin_example
<message text>

Person <person@mail.org> writes:

> Stuff

--
Yours,
me
#+end_example

This creates issues with certain email clients. For instance, MS Exchange often just cuts the text at =Person <person@mail.org>....=, so there's no way to see the signature from the UI.

What's more, MS Exchange, Gmail and other such clients add the signature before the quotation block, like that:

#+begin_example
<message text>

--
Yours,
me

Person <person@mail.org> writes:

> Stuff
#+end_example

So here I modifiy the citation function to insert the signature like in the second example for +certain cases+.

Edit <2022-10-27 Thu>: for consistency's sake, I'll make the signature on the top for all cases.

#+begin_src emacs-lisp
(defun my/message-insert-signature-need-on-top ()
  t)
#+end_src

Then advice the =notmuch-mua-reply= function:
#+begin_src emacs-lisp
(defun my/message-maybe-fix-signature (&rest _)
  (when (my/message-insert-signature-need-on-top)
    (save-excursion
      (goto-char (point-min))
      (when (re-search-forward message-signature-separator nil t)
        (move-beginning-of-line 0)
        (kill-region (point) (point-max)))
      (message-goto-body)
      (when (re-search-forward (rx "sign=pgpmime") nil t)
        (forward-line))
      (insert (current-kill 0))
      (insert "\n\n")
      (set-buffer-modified-p nil))))

(with-eval-after-load 'notmuch-mua
  (advice-add #'notmuch-mua-reply :after #'my/message-maybe-fix-signature))
#+end_src
** Warn if no subject
#+begin_src emacs-lisp
(defun my/message-ensure-subject ()
  (unless (or (message-field-value "Subject")
              (y-or-n-p "No subject. Send? "))
    (user-error "Aborting.")))

(add-hook 'notmuch-mua-send-hook #'my/message-ensure-subject)
#+end_src
** Ensure password is loaded
Otherwise =msmtp= may call =pinentry= while Emacs is locked, which means EXWM can't process the password window.

#+begin_src emacs-lisp
(defun my/ensure-password ()
  (interactive)
  (my/password-store-get "Job/Digital/Email/pvkorytov@etu.ru"))

(add-hook 'notmuch-mua-send-hook #'my/ensure-password)
#+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
