diff --git a/elisp/khard.el b/elisp/khard.el
index 871125c..dc4857e 100644
--- a/elisp/khard.el
+++ b/elisp/khard.el
@@ -1,42 +1,38 @@
-;;; khard.el --- Emacs integration with khard
+;;; khard.el --- Emacs integration with khard -*- lexical-binding: t -*-
 ;;; Commentary:
 ;;; Code:
 
 (require 'with-editor)
+(require 'cl-lib)
+(require 'message)
 
-(add-to-list 'display-buffer-alist '(" \\*khard output\\*" . (display-buffer-no-window)))
+(defcustom khard-executable "khard"
+  "The executable to use to run khard."
+  :group 'khard
+  :type 'string)
+
+(defvar-local khard--contacts-cache ()
+  "List of contacts used while completing at point.
+This exists so that Emacs doesn't slow down while running
+`completion-at-point-functions'.  This is local to each buffer.")
 
 (defun khard--build-list-entry-detail (&rest items)
   "Build a detail in the format \" (ITEMS)\", or an empty string."
   (let ((clean-items (remove "" items)))
-    (if (not (seq-empty-p clean-items))
-        (format " (%s)"
-                (string-join clean-items ", "))
+    (if clean-items
+        (format " (%s)" (string-join clean-items ", "))
       "")))
 
-(defun khard--remove-leading-label (field)
-  "Remove a leading \"name: \" from FIELD."
-  (if-let (index (string-search ":" field))
-      (substring field (+ index 2))
-    field))
-
 (defun khard--build-uid-email-phone-list ()
   "Build a list in the format (info . uid)."
-  (let ((lines (process-lines "khard"
-                              "ls"
-                              "--parsable"
-                              "--fields=uid,name,email,phone")))
-    (mapcar (lambda (line)
-              (let* ((fields (split-string line "\t"))
-                     (uid (car fields))
-                     (name (cadr fields))
-                     (email (khard--remove-leading-label (caddr fields)))
-                     (phone (khard--remove-leading-label (cadddr fields))))
-                (cons (format "%s%s"
-                              name
-                              (khard--build-list-entry-detail email phone uid))
-                      uid)))
-            lines)))
+  (cl-loop for line in
+           (process-lines "khard" "ls"
+                          "--parsable" "--fields=uid,name,email,phone")
+           for (uid name email phone) = (split-string line "\t")
+           collect
+           (cons (format "%s%s" name
+                         (khard--build-list-entry-detail email phone uid))
+                 uid)))
 
 (defun khard--prompt-contact (&optional prompt)
   "Prompt user for a contact, optionally make the prompt text PROMPT."
@@ -48,69 +44,69 @@
   "Process sentinel for kahrd commands.
 For info on PROC and STATUS, see `set-process-sentinel'."
   (when (memq (process-status proc) '(exit signal))
-    (shell-command-set-point-after-cmd (process-buffer proc))
     (message "khard: %s." (substring status 0 -1))))
 
+(cl-defun khard--run-khard (args &key filter)
+  "Run khard with ARGS.
+FILTER is a process filter to install on the child process."
+  (let ((process-environment process-environment))
+    (setenv "EDITOR" with-editor-sleeping-editor)
+    (make-process
+     :name (concat "khard" (car args))
+     :command (apply 'list khard-executable args)
+     :buffer nil
+     :filter filter
+     :sentinel 'khard--process-sentinel)))
+
 (defun khard-delete (contact no-confirm)
   "Delete CONTACT, which is of the form (name . uid).
 When called interactively, prompt the user.
 If NO-CONFIRM is nil, do not ask the user."
   (interactive (list (khard--prompt-contact "Delete Contact ") nil))
   (when (or no-confirm (yes-or-no-p (format "Really delete \"%s\"? "
-                                            (car-safe contact))))
-    (make-process :name "khard delete"
-                  :command
-                  `("khard" "delete" "--force"
-                    ,(format "uid:%s" (cdr-safe contact)))
-                  :buffer " *khard output*"
-                  :sentinel #'khard--process-sentinel)))
+                                            (car contact))))
+    (khard--run-khard (list "delete" "--force"
+                            (format "uid:%s" (cdr contact))))))
 
 (defun khard--prompt-address-book ()
   "Prompt for an address book."
   (completing-read "Address Book " (process-lines "khard" "abooks")))
 
 (defun khard--new-process-filter (proc str)
-  "Process filter for `khard-new'.
+  "Process filter for `khard-new' and `khard-edit'.
 PROC and STR are described in `set-process-filter'."
   (let ((lines (string-split str "\n"))
-        (error-msg nil))
+        (errors nil))
     (dolist (line lines)
-      (if (equal
-           "Do you want to open the editor again? (y/N) "
-           line)
-          (if (y-or-n-p (format "%sReopen the editor? "
-                                (or error-msg
-                                    "Unknown error")))
-              (process-send-string proc "y\n")
-            (process-send-string proc "n\n"))
-        (setq error-msg (concat error-msg "\n" line)))))
+      (cond
+       ((string-prefix-p "Do you want to open the editor again? " line)
+        (if (y-or-n-p (format "%sReopen the editor? "
+                              (cond
+                               ((null errors)
+                                "")
+                               ((length= errors 1)
+                                (concat (cl-first errors) ". "))
+                               (t
+                                (concat (string-join errors "\n") "\n")))))
+            (process-send-string proc "y\n")
+          (process-send-string proc "n\n")))
+       ((string-match (rx bos "Error: " (group (+ any)) eol) line)
+        (push (match-string 1 line) errors)))))
   (with-editor-process-filter proc str t))
 
 (defun khard-new (abook)
   "Create a new card and open it in an new buffer to edit.
 When called interactively, prompt for ABOOK."
   (interactive (list (khard--prompt-address-book)))
-  (when abook
-    (let ((error-msg nil))
-      (make-process :name "khard new"
-                    :command
-                    `("env" ,(concat "EDITOR=" with-editor-sleeping-editor)
-                      "khard" "new" "--edit" "-a" ,abook)
-                    :buffer " *khard output*"
-                    :filter #'khard--new-process-filter
-                    :sentinel #'khard--process-sentinel))))
+  (khard--run-khard (list "new" "--edit" "-a" abook)
+                    :filter 'khard--new-process-filter))
 
 (defun khard-edit (uid)
   "Edit the contact with UID.
 When called interactively, prompt the user."
   (interactive (list (cdr-safe (khard--prompt-contact "Edit Contact "))))
-  (make-process :name "khard edit"
-                :command
-                `("env" ,(concat "EDITOR=" with-editor-sleeping-editor)
-                 "khard" "edit" "--edit" ,(format "uid:%s" uid))
-                :buffer " *khard output*"
-                :filter #'khard--new-process-filter
-                :sentinel #'khard--process-sentinel))
+  (khard--run-khard (list "edit" "--edit" (format "uid:%s" uid))
+                    :filter 'khard--new-process-filter))
 
 (defun khard--parse-email-list (list-str)
   "Parse LIST-STR, a python dictionary and array string of emails."
@@ -133,7 +129,7 @@ When called interactively, prompt the user."
                ((= char ?\\)
                 (setq backslash t))
                ((= char ?')
-                (add-to-list 'output cur-str)
+                (push cur-str output)
                 (setq cur-str ""
                       in-quote nil))
                (t
@@ -148,27 +144,65 @@ When called interactively, prompt the user."
 
 (defun khard--make-email-contacts-list ()
   "Make a list of email contacts from khard."
-  (let ((lines (process-lines "khard"
-                              "ls"
-                              "--parsable"
-                              "--fields=name,emails"))
+  (let ((lines (process-lines "khard" "ls"
+                              "--parsable" "--fields=name,emails"))
         (output nil))
     (dolist (line lines)
-      (let* ((fields (split-string line "\t"))
-             (name (car fields))
-             (email-list (cadr fields)))
+      (cl-destructuring-bind (name email-list)
+          (split-string line "\t")
         (dolist (email (khard--parse-email-list email-list))
-          (add-to-list 'output (format "%s <%s>"
-                                       name
-                                       email)))))
-    output))
+          (push (format "%s <%s>"
+                        name
+                        email)
+                output))))
+    (seq-uniq output)))
+
+(defun khard--contacts-cache (&optional force)
+  "Return the contacts cache, building it if nessesary.
+With FORCE, rebuild the cache no matter what."
+  (when (or force (not khard--contacts-cache))
+    (setq-local khard--contacts-cache (khard--make-email-contacts-list)))
+  khard--contacts-cache)
 
 (defun khard-insert-email-contact ()
   "Use `completing-read' to prompt for and insert a khard contact."
   (interactive)
   (if-let (contact (completing-read "Insert Contact "
-                                    (khard--make-email-contacts-list)))
+                                    (khard--contacts-cache t)))
       (insert contact)))
 
+(defun khard--message-in-header-p (name &optional testfn)
+  "If in field NAME, return the start of the header, otherwise, return nil.
+The name is compared with the field name using TESTFN (defaults to `equal')."
+  (save-excursion
+    (when (and (message-point-in-header-p)
+               (message-beginning-of-header t))
+      (beginning-of-line)
+      (when (and (looking-at (rx bol (group (+? any)) ":" (? " ")))
+                 (funcall (or testfn 'equal) (match-string 1) name))
+        (match-end 0)))))
+
+(defun khard-message-mode-capf ()
+  "Completion at point function for khard contacts in message mode."
+  (interactive)
+  (when-let ((field-start (khard--message-in-header-p "To")))
+    (save-excursion
+      (let ((end (point)))
+        (re-search-backward (rx (any "\n" "," ":") (* whitespace))
+                            field-start t)
+        (list (match-end 0) end (khard--contacts-cache))))))
+
+(defun khard-refresh-contact-cache (all-buffers &optional no-refresh)
+  "Refresh the khard contact cache.
+When ALL-BUFFERS is non-nil, as it is with a prefix argument, refresh the cache
+of all buffers.  With NO-REFRESH, don't refresh the cache, just clear it."
+  (interactive "P")
+  (let ((new-cache (and (not no-refresh) (khard--make-email-contacts-list))))
+    (if all-buffers
+        (cl-loop for buf being the buffers do
+                 (setf (buffer-local-value 'khard--contacts-cache buf)
+                       new-cache))
+      (setq-local khard--contacts-cache new-cache))))
+
 (provide 'khard)
 ;;; khard.el ends here
diff --git a/init.el b/init.el
index 1544f4c..831a77f 100644
--- a/init.el
+++ b/init.el
@@ -20,9 +20,9 @@
 
 ;; use-package
 (eval-when-compile
+  (require 'use-package)
   (setq use-package-always-ensure t
-        package-user-dir "~/.emacs.d/var/elpa")
-  (require 'use-package))
+        package-user-dir "~/.emacs.d/var/elpa"))
 
 ;; no-littering
 (use-package no-littering
@@ -48,8 +48,8 @@
 (use-package emacs
   :hook (;;(emacs-lisp-mode . my/-emacs-lisp-mode-setup-evil-lookup)
          ;;(prog-mode . electric-pair-local-mode)
-         ((text-mode message-mode tex-mode prog-mode) . auto-fill-mode)
-         ((text-mode message-mode tex-mode prog-mode) . my/-enable-show-trailing-whitespace))
+         ((text-mode tex-mode prog-mode) . auto-fill-mode)
+         ((text-mode tex-mode prog-mode) . my/-enable-show-trailing-whitespace))
   :init
   (defun my/-enable-show-trailing-whitespace ()
     (setq-local show-trailing-whitespace t))
@@ -435,14 +435,14 @@ directory. Otherwise, run `find-file' on that file."
          :map evil-cleverparens-mode-map
          ("C-c o" . evil-cp-open-below-form))
   :custom
+  (evil-cleverparens-use-s-and-S nil)
+  :config
   (eldoc-add-command 'paredit-RET
                      'paredit-open-round
                      'paredit-open-angled
                      'paredit-open-bracket
                      'paredit-open-angled
                      'paredit-open-parenthesis)
-  (evil-cleverparens-use-s-and-S nil)
-  :config
   (define-key evil-cleverparens-mode-map (kbd "<normal-state> M-o") nil t)
   (defun my/-enable-evil-cleverparens ()
     (if (member major-mode '(lisp-mode emacs-lisp-mode
@@ -712,7 +712,8 @@ visual states."
     ;; Only run this if we are not in `TeX-mode'
     (unless (bound-and-true-p TeX-mode-p)
       (setq-local completion-at-point-functions
-                  '(cape-dict cape-dabbrev)
+                  (nconc completion-at-point-functions '(cape-dict
+                                                         cape-dabbrev))
                   corfu-auto nil))))
 
 ;; xref
@@ -1734,13 +1735,27 @@ If no name is given, list all bookmarks instead."
 ;; khard contacts
 (require 'khard)
 
+;; This is also in khard (see above), it's just also here so that if I remove
+;; that file ever, other things will not break.
+(defun my/message-in-header-p (name &optional testfn)
+  "If in field NAME, return the start of the header, otherwise, return nil.
+The name is compared with the field name using TESTFN (defaults to `equal')."
+  (save-excursion
+    (when (and (message-point-in-header-p)
+               (message-beginning-of-header t))
+      (beginning-of-line)
+      (when (and (looking-at (rx bol (group (+? any)) ":" (? " ")))
+                 (funcall (or testfn 'equal) (match-string 1) name))
+        (match-end 0)))))
+
 ;; mu4e
 (use-package mu4e
   :ensure nil
   :defer nil
   :hook ((mu4e-index-updated . my/-mu4e-enable-index-messages)
          (mu4e-main-mode . my/-mu4e-setup-main-mode)
-         (mu4e-view-mode . my/-mu4e-setup-view-mode))
+         (mu4e-view-mode . my/-mu4e-setup-view-mode)
+         (mu4e-compose-mode . my/-mu4e-setup-compose-mode))
   :bind (("C-x C-m" . mu4e)
          ("C-x m" . mu4e-compose-new)
          :map message-mode-map
@@ -1779,6 +1794,22 @@ If no name is given, list all bookmarks instead."
     (interactive)
     (mu4e--view-in-headers-context
      (my/mu4e-headers-mark-for-trash)))
+  (defun my/-mu4e-enable-autocomplete-in-header ()
+    ;; corfu auto must be t (not the integer returned by
+    ;; `my/message-in-header-p'
+    (setq-local corfu-auto (and (not (window-minibuffer-p))
+                                (my/message-in-header-p "To")
+                                t)))
+  (defun my/-mu4e-setup-compose-mode ()
+    (add-hook 'post-command-hook 'my/-mu4e-enable-autocomplete-in-header
+              nil t)
+    (add-to-list
+     (make-local-variable 'completion-at-point-functions)
+     (cape-capf-super #'mu4e-complete-contact #'khard-message-mode-capf)))
+  (defun my/-mu4e-fix-cycle-threshold ()
+    (setq-local completion-cycle-threshold nil))
+  (advice-add 'mu4e--compose-setup-completion :after
+              'my/-mu4e-fix-cycle-threshold)
   (setq message-kill-buffer-on-exit t
         message-send-mail-function 'sendmail-send-it
         mu4e-change-filenames-when-moving t