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diff --git a/src/jd/features/mail.scm b/src/jd/features/mail.scm
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+(define-module (jd features mail)
+  #:use-module (rde packages)
+  #:use-module (rde exceptions)
+  #:use-module (rde features)
+  #:use-module (rde predicates)
+  #:use-module (rde features emacs)
+  #:use-module (rde features mail)
+  #:use-module ((rde features mail providers) #:prefix mail-providers:)
+  #:use-module (gnu packages mail)
+  #:use-module (gnu packages emacs-xyz)
+  #:use-module (rde packages emacs-xyz)
+  #:use-module (rde packages mail)
+  #:use-module (rde serializers elisp)
+  #:use-module (rde home services mail)
+  #:use-module (gnu services)
+  #:use-module (gnu services configuration)
+  #:use-module (gnu home services)
+  #:use-module (gnu home-services mail)
+  #:use-module (gnu home services mcron)
+  #:use-module (gnu home-services version-control)
+  #:use-module (gnu home services xdg)
+
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-1)
+  #:use-module (guix gexp)
+  #:use-module (guix deprecation)
+  #:use-module (guix diagnostics)
+  #:use-module (guix i18n)
+
+  #:export (feature-l2md* feature-mail-mcron feature-octave))
+
+(define* (feature-l2md*
+          #:key
+          (l2md l2md))
+  "Configure l2md MDA."
+  (ensure-pred file-like? l2md)
+
+  (define (get-home-services config)
+    (require-value 'mail-directory-fn config)
+    (require-value 'mailing-lists config)
+    (define mail-dir ((get-value 'mail-directory-fn config) config))
+    (define mls (filter (lambda (x) (eq? (mailing-list-synchronizer x) 'l2md))
+                        (get-value 'mailing-lists config)))
+    (define (get-repo-config ml)
+      (let ((repo-config (mailing-list-config ml)))
+        (if (eq? %unset-value (l2md-repo-maildir repo-config))
+            (l2md-repo
+             (inherit repo-config)
+             (maildir (string-append
+                       mail-dir "/lists/" (mailing-list-fqda ml) "/archive")))
+            repo-config)))
+    ;; <https://git.kernel.org/pub/scm/linux/kernel/git/dborkman/l2md.git/about/>
+    ;; Applying patches <https://git.kyleam.com/piem/about/>
+
+    (define add-ml-tag
+      (map (lambda (x)
+             (format
+              #f "notmuch tag +~a -- path:lists/~a/**"
+              ;; TODO: Use new tag not to retag already existing entities.
+              ;; Do it before new tag will be romved
+              ;; TODO: Fix order of items in post-new hook
+              (mailing-list-id x) (mailing-list-fqda x)))
+           mls))
+
+    (list
+     (simple-service
+      'l2md-add-tags-to-mailing-list
+      home-notmuch-service-type
+      (home-notmuch-extension
+       (post-new
+        (list
+         #~(begin (for-each system '#$add-ml-tag))))))
+
+     (service
+      home-l2md-service-type
+      (home-l2md-configuration
+       (l2md l2md)
+       (oneshot 1)
+       (repos (map get-repo-config mls))))))
+
+  (feature
+   (name 'l2md)
+   (home-services-getter get-home-services)
+   (values `((l2md . ,l2md)))))
+
+(define* (feature-mail-mcron
+          #:key
+          (time-spec '(next-minute
+                       (range 0 60 20))))
+  "Configure mcron to invoke other email commands based on the other
+features that have been enabled."
+  (define (get-home-services config)
+    (list
+     (when (get-value 'isync config)
+       (let* ((sync-cmd (list `(,((get-value 'mbsync config) config) "-a")))
+              (notmuch-cmd (if (get-value 'notmuch config)
+                                (list `(,(file-append (get-value 'notmuch config) "/bin/notmuch")
+                                        "new"))
+                                (list)))
+              (l2md-cmd (if (get-value 'l2md config)
+                             (list `(,(file-append (get-value 'l2md config) "/bin/l2md")))
+                             (list))))
+         (simple-service
+          'isync-mcron-job
+          home-mcron-service-type
+          (list
+           #~(job '#$time-spec
+                  (lambda ()
+                    (setenv "DISPLAY" ":0")
+                    #$@(map (lambda (x) `(system* ,@x))
+                            (append sync-cmd l2md-cmd notmuch-cmd))))))))))
+
+  (feature
+   (name 'mail-mcron)
+   (home-services-getter get-home-services)))
+
+(define* (feature-octave
+          #:key (octave (@ (gnu packages maths) octave-cli)))
+  (define f-name 'octave)
+  (define (get-home-services config)
+    (list
+     (rde-elisp-configuration-service
+      f-name
+      config
+      `((with-eval-after-load 'org
+          (require 'ob-octave)
+          (add-to-list 'org-structure-template-alist
+                       '("octave" . "src octave"))
+          (org-babel-do-load-languages
+           'org-babel-load-languages
+           '((octave . t)))
+          (setq org-babel-default-header-args:octave
+                '((:results . "output")
+                  (:session . "octave")
+                  (:exports . "both")
+                  (:eval . "no-export"))))))
+     (simple-service
+      'octave-packages
+      home-profile-service-type
+      (append (or (and (get-value 'python config)
+                       (list (@ (gnu packages python-xyz) python-sympy)))
+                  '())
+              (list octave)))))
+  (feature
+   (name f-name)
+   (values `((,f-name . #t)))
+   (home-services-getter get-home-services)))