diff --git a/hosts/yodaHedgehog/host-specific.nix b/hosts/yodaHedgehog/host-specific.nix
index 7f6e889..afc9de0 100644
--- a/hosts/yodaHedgehog/host-specific.nix
+++ b/hosts/yodaHedgehog/host-specific.nix
@@ -11,6 +11,8 @@
 
 { config, pkgs, ... }:
 let
+  email = config.yoda.email;
+
   backup-source = "rootNas";
   # The "stay-awake" file is located at `${backup-source}:${stay-awake-file}`.
   # Example: ssh rootNas 'touch yodaHedgehog.stay-awake'
@@ -85,11 +87,11 @@ in
         printf '%s\n' 'Delaying backup due to SSH connectivity problems.'
         # After the fourth failed connection attempt, send a notification by email.
         if [ "''${i}" = "4" ]; then
-          printf '%s\n\n%s' 'Subject: ${config.networking.hostName}' 'Error connecting to ${backup-source}. Will retry in some seconds.' | sendmail -f langbein@mail.de daniel@systemli.org
+          printf '%s\n\n%s' 'Subject: ${config.networking.hostName}' 'Error connecting to ${backup-source}. Will retry in some seconds.' | sendmail -f langbein@mail.de ${email}
         fi
         # After ${retries} failed connection attempts, send a second notification by email and give up.
         if [ "''${i}" = "${retries}" ]; then
-          printf '%s\n\n%s' 'Subject: ${config.networking.hostName}' 'Error connecting to ${backup-source} for ${retries} times. Giving up!' | sendmail -f langbein@mail.de daniel@systemli.org
+          printf '%s\n\n%s' 'Subject: ${config.networking.hostName}' 'Error connecting to ${backup-source} for ${retries} times. Giving up!' | sendmail -f langbein@mail.de ${email}
           exit 1
         fi
         # Wait some seconds before repeating.
@@ -140,7 +142,7 @@ in
       # Send filtered journal by email.
       systemctl start journalwatch.service ||:
       # Send notification by email.
-      printf '%s\n\n%s' 'Subject: ${config.networking.hostName}' 'Finished backup.' | sendmail -f langbein@mail.de daniel@systemli.org
+      printf '%s\n\n%s' 'Subject: ${config.networking.hostName}' 'Finished backup.' | sendmail -f langbein@mail.de ${email}
 
       # Let sendmail send emails.
       #while :; do
diff --git a/modules/ark.nix b/modules/ark.nix
index ae69e1d..fb012f7 100644
--- a/modules/ark.nix
+++ b/modules/ark.nix
@@ -8,6 +8,8 @@
 
 { config, pkgs, lib, ... }:
 let
+  user = config.yoda.user;
+
   extraTools = with pkgs; [
     p7zip
     lrzip
@@ -36,7 +38,7 @@ in
    "unrar"
   ];
 
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       ark-with-unrar # Archive manager: Compress and decompress
     ];
diff --git a/modules/autostart.nix b/modules/autostart.nix
index 6db6b80..3549a88 100644
--- a/modules/autostart.nix
+++ b/modules/autostart.nix
@@ -1,9 +1,12 @@
 { config, pkgs, lib, ... }:
+let
+  user = config.yoda.user;
+in
 {
   # See also:
   #   Temporary workaround until https://github.com/nix-community/home-manager/issues/3447 is merged.
 
-  home-manager.users."yoda" = { osConfig, config, pkgs, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, ... }: {
     home.file."keepassxc" = {
       target = ".config/autostart/org.keepassxc.KeePassXC.desktop";
       source = (pkgs.keepassxc + "/share/applications/org.keepassxc.KeePassXC.desktop");
diff --git a/modules/base-user.nix b/modules/base-user.nix
index 58bb3de..832ef08 100644
--- a/modules/base-user.nix
+++ b/modules/base-user.nix
@@ -1,16 +1,49 @@
+# https://l-lin.github.io/nix/share-variables-between-Nix-modules
+
 { config, lib, pkgs, ... }:
 let
-  defaultUsername = "yoda";
+  defaultUser = "yoda";
+
+  defaultName = "Daniel Langbein";
+  defaultEmail = "daniel@systemli.org";
+  defaultMaintainer = "langbeindaniel";
+  defaultFingerprint = "94F3D3DDAC22802258FC044B6C47C753F0823002";
 in
 {
   options.yoda.user = lib.mkOption {
     # You can find the exhaustive list of types here: https://nlewo.github.io/nixos-manual-sphinx/development/option-types.xml.html
     type = lib.types.str;
-    default = defaultUsername;
-    description = "Username of the primary Linux user account. Must not include regex special characters.";
+    default = defaultUser;
+    description = "Primary Linux user name. Must not include regex special characters.";
+  };
+  options.yoda.name = lib.mkOption {
+    type = lib.types.str;
+    default = defaultName;
+    description = "Personal name of primary user.";
+  };
+  options.yoda.email = lib.mkOption {
+    type = lib.types.str;
+    default = defaultEmail;
+    description = "Personal email address of primary user.";
+  };
+  options.yoda.maintainer = lib.mkOption {
+    type = lib.types.str;
+    default = defaultMaintainer;
+    description = "Personal nix maintainer identifier of primary user";
+  };
+  options.yoda.fingerprint = lib.mkOption {
+    type = lib.types.str;
+    default = defaultFingerprint;
+    description = "Personal key fingerprint of primary user as listed by `gpg --list-keys`.";
   };
 
   config = {
-    yoda.user = defaultUsername;
+    lib.maintainers."${defaultMaintainer}" = {
+      name = defaultName;
+      email = defaultEmail;
+      keys = [{
+        fingerprint = defaultFingerprint;
+      }];
+    };
   };
 }
diff --git a/modules/bash.nix b/modules/bash.nix
index 1608b09..d823e7f 100644
--- a/modules/bash.nix
+++ b/modules/bash.nix
@@ -1,5 +1,7 @@
 { config, pkgs, ... }:
 let
+  user = config.yoda.user;
+
   bash-config = {
     enable = true;
     enableCompletion = true;
@@ -18,7 +20,7 @@ in
   # Required by home-manager programs.bash.enableCompletion
   environment.pathsToLink = [ "/share/bash-completion" ];
 
-  home-manager.users."yoda" = { osConfig, config, pkgs, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, ... }: {
     programs.bash = bash-config;
   };
   home-manager.users."root" = { osConfig, config, pkgs, ... }: {
diff --git a/modules/blackbox.nix b/modules/blackbox.nix
index daa53da..c7d063b 100644
--- a/modules/blackbox.nix
+++ b/modules/blackbox.nix
@@ -1,9 +1,12 @@
 { config, pkgs, ... }:
+let
+  user = config.yoda.user;
+in
 {
   # A direct integration in Nautilus is still in progress: https://gitlab.gnome.org/raggesilver/blackbox/-/issues/20
   # Thus, we use nautilus-open-any-terminal.
 
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
        blackbox-terminal # Terminal emulator. Can show notifications for commands finished in the background.
        nautilus-open-any-terminal # For Nautilus (GNOME files) integration
@@ -11,7 +14,7 @@
   };
 
   programs.dconf.enable = true;
-  home-manager.users."yoda" = { osConfig, config, pkgs, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, ... }: {
     dconf.settings = {
       # For Nautilus (GNOME files) integration
       "com/github/stunkymonkey/nautilus-open-any-terminal" = {
diff --git a/modules/digikam-rawtherapee-hugin-gimp.nix b/modules/digikam-rawtherapee-hugin-gimp.nix
index 149878a..1f1ded3 100644
--- a/modules/digikam-rawtherapee-hugin-gimp.nix
+++ b/modules/digikam-rawtherapee-hugin-gimp.nix
@@ -1,6 +1,9 @@
 { config, pkgs, ... }:
+let
+  user = config.yoda.user;
+in
 {
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       # TODO: Temporary fix until exiftool fix is landed in NixOS stable
       # https://github.com/NixOS/nixpkgs/issues/332561
diff --git a/modules/docker-pushrm-pkg.nix b/modules/docker-pushrm-pkg.nix
index d4e00d0..766f432 100644
--- a/modules/docker-pushrm-pkg.nix
+++ b/modules/docker-pushrm-pkg.nix
@@ -1,4 +1,7 @@
-{ pkgs, lib, buildGoModule, fetchFromGitHub }:
+{ config, pkgs, lib, buildGoModule, fetchFromGitHub }:
+let
+  maintainer = config.yoda.maintainer;
+in
 
 # TODO: `docker pushrm` does not work, however `docker-pushrm` does.
 # TODO: Watch for new releases
@@ -48,6 +51,6 @@ buildGoModule rec {
     '';
     homepage = "https://github.com/christian-korneck/docker-pushrm";
     license = licenses.mit;
-    maintainers = with maintainers; [ langbeindaniel ];
+    maintainers = with maintainers; [ maintainer ];
   };
 }
diff --git a/modules/docker-pushrm.nix b/modules/docker-pushrm.nix
index 6ed14cd..72ce599 100644
--- a/modules/docker-pushrm.nix
+++ b/modules/docker-pushrm.nix
@@ -1,15 +1,5 @@
 { config, pkgs, lib, ... }:
 {
-  lib.maintainers = {
-    langbeindaniel = {
-      name = "Daniel Langbein";
-      email = "daniel@systemli.org";
-      keys = [{
-        fingerprint = "94F3 D3DD AC22 8022 58FC  044B 6C47 C753 F082 3002";
-      }];
-    };
-  };
-
   environment.systemPackages = with pkgs; [
     (
       # callPackage is a function that automagically figures out which arguments your function wants, and then provides them from its own set. This pill explains it well: https://nixos.org/guides/nix-pills/callpackage-design-pattern.html
diff --git a/modules/element-desktop.nix b/modules/element-desktop.nix
index a39da2b..feb6538 100644
--- a/modules/element-desktop.nix
+++ b/modules/element-desktop.nix
@@ -1,10 +1,13 @@
 { config, pkgs, lib, ... }:
+let
+  user = config.yoda.user;
+in
 {
   # Issue: Login does not work. Webbrowser does not redirect back to Element app. Firefox does not ask to open link with Element app. It works with the Flatpak version though.
   #
   # Configuration paths with user data:
-  #   NixOS: /home/yoda/.config/Element /home/yoda/.config/Riot
-  #   Flatpak: /home/yoda/.var/app/im.riot.Riot/config/Element
+  #   NixOS: /home/${user}/.config/Element /home/${user}/.config/Riot
+  #   Flatpak: /home/${user}/.var/app/im.riot.Riot/config/Element
   #
   # Solution: Don't use element-desktop-wayland, use the normal element-desktop package instead
   #
@@ -18,7 +21,7 @@
   # Workaround: Use Flatpak version ...
   # Discussion on GitHub: https://github.com/NixOS/nixpkgs/issues/343806 AMD GPUs and NixOS - 'Cannot find target for triple amdgcn-- Unable to find target for this triple (no targets are registered)'
 
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       # Matrix chat client.
       element-desktop
diff --git a/modules/firefox.nix b/modules/firefox.nix
index 03d8052..3e38957 100644
--- a/modules/firefox.nix
+++ b/modules/firefox.nix
@@ -1,6 +1,9 @@
 { config, pkgs, lib, ... }:
+let
+  user = config.yoda.user;
+in
 {
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       firefox # Web browser
     ];
@@ -14,7 +17,7 @@
   # Required for dconf.settings
   programs.dconf.enable = true;
 
-  home-manager.users."yoda" = { osConfig, config, pkgs, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, ... }: {
     dconf.settings = {
       "org/gnome/shell" = {
         favorite-apps = ["firefox.desktop"];
diff --git a/modules/freetube.nix b/modules/freetube.nix
index c6c640f..fb881ab 100644
--- a/modules/freetube.nix
+++ b/modules/freetube.nix
@@ -1,6 +1,9 @@
 { config, pkgs, lib, ... }:
+let
+  user = config.yoda.user;
+in
 {
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       unstable.freetube # YouTube client.
     ];
diff --git a/modules/fwupd-gnome.nix b/modules/fwupd-gnome.nix
index d5f65b1..e18b6fe 100644
--- a/modules/fwupd-gnome.nix
+++ b/modules/fwupd-gnome.nix
@@ -1,9 +1,12 @@
 { config, pkgs, ... }:
+let
+  user = config.yoda.user;
+in
 {
   # Enable firmware update daemon
   services.fwupd.enable = true;
 
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       # Install firmware on devices supported by fwupd.
       gnome-firmware
diff --git a/modules/fzf.nix b/modules/fzf.nix
index 78c0fc4..36d62b6 100644
--- a/modules/fzf.nix
+++ b/modules/fzf.nix
@@ -1,5 +1,7 @@
 { config, pkgs, ... }:
 let
+  user = config.yoda.user;
+
   # Fuzzy shell history and file search.
   #
   # Use fzf to search your command history (with STRG + r) and do file searches (with STRG + t).
@@ -17,14 +19,14 @@ let
   };
 in
 {
-  home-manager.users."yoda" = { osConfig, config, pkgs, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, ... }: {
     programs.fzf = fzf-config;
   };
   home-manager.users."root" = { osConfig, config, pkgs, ... }: {
     programs.fzf = fzf-config;
   };
 
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       fd
     ];
diff --git a/modules/ghostwriter.nix b/modules/ghostwriter.nix
index 6b625e0..581039f 100644
--- a/modules/ghostwriter.nix
+++ b/modules/ghostwriter.nix
@@ -1,6 +1,9 @@
 { config, pkgs, lib, ... }:
+let
+  user = config.yoda.user;
+in
 {
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       libsForQt5.ghostwriter # Markdown editor
     ];
@@ -9,7 +12,7 @@
   # This fixes blurry fonts with fractional scaling on Wayland.
   environment.sessionVariables.QT_QPA_PLATFORM = lib.mkIf (config.services.xserver.displayManager.gdm.wayland) "wayland";
 
-  home-manager.users."yoda" = { osConfig, config, pkgs, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, ... }: {
     home.file.".config/kde.org/ghostwriter.conf" = {
       text = ''
         [Application]
diff --git a/modules/git.nix b/modules/git.nix
index cb1b78b..b96c6b3 100644
--- a/modules/git.nix
+++ b/modules/git.nix
@@ -1,16 +1,21 @@
 { config, pkgs, ... }:
+let
+  user  = config.yoda.user;
+  name  = config.yoda.name;
+  email = config.yoda.email;
+in
 {
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       git
     ];
   };
 
-  home-manager.users."yoda" = { osConfig, config, pkgs, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, ... }: {
     programs.git = {
       enable = true;
-      userName = "Daniel Langbein";
-      userEmail = "daniel@systemli.org";
+      userName = name;
+      userEmail = email;
       signing.signByDefault = true;
       signing.key = null;
       aliases = {
diff --git a/modules/gnome-wallpaper.nix b/modules/gnome-wallpaper.nix
index 85faa4d..de86f06 100644
--- a/modules/gnome-wallpaper.nix
+++ b/modules/gnome-wallpaper.nix
@@ -1,14 +1,17 @@
 { config, pkgs, ... }:
+let
+  user = config.yoda.user;
+in
 {
   # https://discourse.nixos.org/t/how-to-set-gnome-a-k-a-gdm-greeter-a-k-a-lockscreen-login-background-a-k-a-wallpaper/14289
 
   programs.dconf.enable = true;
 
-  home-manager.users."yoda" = { osConfig, config, pkgs, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, ... }: {
     dconf.settings = {
         "org/gnome/desktop/background" = {
-            "picture-uri" = "/home/yoda/.config/background";
-            "picture-uri-dark" = "/home/yoda/.config/background";
+            "picture-uri" = "/home/${user}/.config/background";
+            "picture-uri-dark" = "/home/${user}/.config/background";
         };
     };
     home.file.".config/background".source = "${(pkgs.callPackage ./wallpaper.nix { })}/img.jpg";
diff --git a/modules/headless.nix b/modules/headless.nix
index 46466bb..ef67adb 100644
--- a/modules/headless.nix
+++ b/modules/headless.nix
@@ -1,6 +1,9 @@
 { config, pkgs, ... }:
+let
+  user = config.yoda.user;
+in
 {
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       #zenith # Terminal resource monitor / task manager
       btop   # Terminal resource monitor / task manager
diff --git a/modules/home-manager.nix b/modules/home-manager.nix
index 6224779..32c4bad 100644
--- a/modules/home-manager.nix
+++ b/modules/home-manager.nix
@@ -1,5 +1,7 @@
 { config, pkgs, ... }:
 let
+  user = config.yoda.user;
+
   # Import Home Manager with niv.
   home-manager = (import ../nix/sources.nix).home-manager;
   #home-manager-source = import (import ../nix/sources.nix).home-manager {};
@@ -19,7 +21,7 @@ in
   # https://nix-community.github.io/home-manager/index.html#sec-install-nixos-module
   home-manager.useGlobalPkgs = true;
 
-  home-manager.users."yoda" = { osConfig, config, pkgs, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, ... }: {
     # https://nixos.wiki/wiki/FAQ/When_do_I_update_stateVersion
     # Switching to a higher state version typically requires performing some manual steps, such as data conversion or moving files.
     home.stateVersion = "24.11";
diff --git a/modules/initrd-contact-info.nix b/modules/initrd-contact-info.nix
index 8e619a1..1907abd 100644
--- a/modules/initrd-contact-info.nix
+++ b/modules/initrd-contact-info.nix
@@ -38,12 +38,12 @@ let
     in
     lib.optionalString (res != null) (lib.head res);
 
-  contact_name = "Daniel Langbein";
+  contact_name = config.yoda.name;
   # The file `phone-number` contains only one line with our phone number, e.g. +49 0173 ...
   # Be aware that the phone number will be written to the nix store in plaintext!
   # TODO: strip the read string (no tailing newlines)
   contact_phone = trim (builtins.readFile ../secrets/phone-number);
-  contact_mail = "daniel@systemli.org";
+  contact_mail = config.yoda.email;
 
   # https://wiki.nixos.org/wiki/Shell_Scripts
   contact-info-str = pkgs.stdenv.mkDerivation rec {
diff --git a/modules/jetbrains-ide.nix b/modules/jetbrains-ide.nix
index ec8390d..1f622a9 100644
--- a/modules/jetbrains-ide.nix
+++ b/modules/jetbrains-ide.nix
@@ -1,5 +1,7 @@
 { config, pkgs, lib, ... }:
 let
+  user = config.yoda.user;
+
 #  version = (
 #    if (config.nixpkgs.config.allowUnfree)
 #    then "idea-ultimate"
@@ -41,14 +43,14 @@ in
     # TODO: Currently markdown previews are broken anyways because of issues with the sandboxed webbrowser on NixOS
   ];
 
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       jetbrains."${version}"
     ];
   };
 
   programs.dconf.enable = true;
-  home-manager.users."yoda" = { osConfig, config, pkgs, lib, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, lib, ... }: {
     dconf.settings = {
       "org/gnome/shell" = {
         favorite-apps = ["${version}.desktop"];
diff --git a/modules/journalwatch.nix b/modules/journalwatch.nix
index 77a4723..e1e4105 100644
--- a/modules/journalwatch.nix
+++ b/modules/journalwatch.nix
@@ -41,6 +41,7 @@
 { config, pkgs, ... }:
 let
   user = config.yoda.user;
+  email = config.yoda.email;
 
   stopped-service-consumption-summary = ''
     \S+\.(service|scope|slice|swap|mount): Consumed ([0-9]+d )?([0-9]+h )?([0-9]+min )?[0-9\.]+(s|ms) CPU time(, .+)?\.'';
@@ -96,7 +97,7 @@ in
     enable = true;
     # Same as configured by sendmail MTA.
     mailFrom = "langbein@mail.de";
-    mailTo = "daniel+journalwatch@systemli.org";
+    mailTo = email;
     #interval = "hourly";
 
     # Lowest priority of message to be considered.
diff --git a/modules/nitrokey-gpg-smartcard.nix b/modules/nitrokey-gpg-smartcard.nix
index 7bbcc40..7d82be4 100644
--- a/modules/nitrokey-gpg-smartcard.nix
+++ b/modules/nitrokey-gpg-smartcard.nix
@@ -1,4 +1,7 @@
 { config, pkgs, lib, ... }:
+let
+  user = config.yoda.user;
+in
 {
   # Use NitroKey USB smartcard with SSH.
   # https://nixos.wiki/wiki/Nitrokey
@@ -38,14 +41,14 @@
   #
   # ssh -v nas
   #=> OpenSSH_9.3p2, OpenSSL 3.0.10 1 Aug 2023
-  #=> debug1: Reading configuration data /home/yoda/.ssh/config
-  #=> debug1: /home/yoda/.ssh/config line 67: Applying options for nas
-  #=> debug1: /home/yoda/.ssh/config line 180: Applying options for *
+  #=> debug1: Reading configuration data /home/${user}/.ssh/config
+  #=> debug1: /home/${user}/.ssh/config line 67: Applying options for nas
+  #=> debug1: /home/${user}/.ssh/config line 180: Applying options for *
   #=> debug1: Reading configuration data /etc/ssh/ssh_config
   #=> debug1: Executing command: '/nix/store/8fv91097mbh5049i9rglc73dx6kjg3qk-bash-5.2-p15/bin/bash -c '/nix/store/lvsbmqy4dmlri22145hbr6799hgbnpnf-gnupg-2.4.0/bin/gpg-connect-agent --quiet updatestartuptty /bye >/dev/null 2>&1''
   #
   #=> USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
-  #=> yoda        2752  0.0  0.0 444812  3040 ?        SLsl 16:09   0:00 /nix/store/lvsbmqy4dmlri22145hbr6799hgbnpnf-gnupg-2.4.0/bin/gpg-agent --supervised --pinentry-program /nix/store/8cvidvpwnwyxixlhqfaa5jlfndh2vir5-pinentry-1.2.1-curses/bin/pinentry
+  #=> ${user}     2752  0.0  0.0 444812  3040 ?        SLsl 16:09   0:00 /nix/store/lvsbmqy4dmlri22145hbr6799hgbnpnf-gnupg-2.4.0/bin/gpg-agent --supervised --pinentry-program /nix/store/8cvidvpwnwyxixlhqfaa5jlfndh2vir5-pinentry-1.2.1-curses/bin/pinentry
 
   # NITROKEY SSH WORKAROUND (I): Do all of this in one shell!
   # CREDITS: https://unix.stackexchange.com/a/250045/315162
@@ -121,7 +124,7 @@
   #  pinentry-gnome
   #];
 
-  #users.users."yoda" = {
+  #users.users."${user}" = {
   #  packages = with pkgs; [
   #    #pinentry-curses
   #    pinentry-gnome
@@ -146,7 +149,7 @@
   # Smartcard daemon.
   services.pcscd.enable = true;
 
-  home-manager.users."yoda" = { osConfig, config, pkgs, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, ... }: {
 
     # Disable GNOME Keyring. See comment above.
     #
diff --git a/modules/obsidian.nix b/modules/obsidian.nix
index 6079f24..7f7a649 100644
--- a/modules/obsidian.nix
+++ b/modules/obsidian.nix
@@ -1,4 +1,7 @@
 { config, pkgs, lib, ... }:
+let
+  user = config.yoda.user;
+in
 {
   # TODO: if on wayland and scaling != 1, start obsidian with the following command.
   # Sharp fonts.
@@ -10,14 +13,14 @@
     "obsidian"
   ];
 
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       obsidian # Markdown notes
     ];
   };
 
   programs.dconf.enable = true;
-  home-manager.users."yoda" = { osConfig, config, pkgs, lib, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, lib, ... }: {
     dconf.settings = {
       "org/gnome/shell" = {
         favorite-apps = ["obsidian.desktop"];
diff --git a/modules/print-and-scan.nix b/modules/print-and-scan.nix
index 652396e..c2b25cd 100644
--- a/modules/print-and-scan.nix
+++ b/modules/print-and-scan.nix
@@ -1,4 +1,7 @@
 { config, pkgs, ... }:
+let
+  user = config.yoda.user;
+in
 {
   # Printing with IPP everywhere capable printers
   #   https://nixos.wiki/wiki/Printing
@@ -58,7 +61,7 @@
     extraBackends = [ pkgs.hplip ];
   };
 
-  users.users."yoda" = {
+  users.users."${user}" = {
     extraGroups = [ "scanner" "lp" ];
     packages = with pkgs; [
       simple-scan # GNOME Document Scanner
diff --git a/modules/programs-kde.nix b/modules/programs-kde.nix
index d58ae1b..d5d6185 100644
--- a/modules/programs-kde.nix
+++ b/modules/programs-kde.nix
@@ -1,4 +1,7 @@
 { config, pkgs, mkKdeDerivation, lib, ... }:
+let
+  user = config.yoda.user;
+in
 {
   imports = [
     ./ark.nix # Archive manager: Compress and decompress
@@ -11,7 +14,7 @@
     "dotnet-runtime-6.0.36"
   ];
 
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       # Preinstalled
       #   kdePackages.ark # Archive manager
diff --git a/modules/sendmail-mta.nix b/modules/sendmail-mta.nix
index a7c6c06..7ff8f37 100644
--- a/modules/sendmail-mta.nix
+++ b/modules/sendmail-mta.nix
@@ -1,4 +1,7 @@
 { config, pkgs, ... }:
+let
+  email = config.yoda.email;
+in
 {
   # Many programs use the `sendmail` command to send email.
   # Nullmailer and OpenSMTP create a symlink from `sendmail` to their binary - they are (to a certain degree) sendmail compatible.
@@ -46,8 +49,8 @@
   # https://nixos.wiki/wiki/Msmtp#Aliases
   environment.etc.aliases = {
     text = ''
-      # Forward email from root to daniel@systemli.org
-      root: daniel@systemli.org
+      # Forward email received by user root to ${email}
+      root: ${email}
     '';
     mode = "0644";
   };
diff --git a/modules/signal-desktop.nix b/modules/signal-desktop.nix
index 6165230..39d1bcc 100644
--- a/modules/signal-desktop.nix
+++ b/modules/signal-desktop.nix
@@ -1,6 +1,9 @@
 { config, pkgs, lib, ... }:
+let
+  user = config.yoda.user;
+in
 {
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       signal-desktop # Signal client
     ];
@@ -23,7 +26,7 @@
     })
   ];
 
-  home-manager.users."yoda" = { osConfig, config, pkgs, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, ... }: {
     dconf.settings = {
       "org/gnome/shell" = {
         favorite-apps = ["signal-desktop.desktop"];
diff --git a/modules/spaceFM.nix b/modules/spaceFM.nix
index 445d1c5..3a29e4d 100644
--- a/modules/spaceFM.nix
+++ b/modules/spaceFM.nix
@@ -1,6 +1,9 @@
 { config, pkgs, lib, ... }:
+let
+  user = config.yoda.user;
+in
 {
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       spaceFM
     ];
diff --git a/modules/ssh-client.nix b/modules/ssh-client.nix
index 4ace94c..dda5bfd 100644
--- a/modules/ssh-client.nix
+++ b/modules/ssh-client.nix
@@ -1,6 +1,9 @@
 { config, pkgs, ... }:
+let
+  user = config.yoda.user;
+in
 {
-  home-manager.users."yoda" = { osConfig, config, pkgs, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, ... }: {
 
     # SSH client configuration.
     programs.ssh = {
@@ -15,13 +18,13 @@
         };
         "yodaTab" = {
           hostname = "192.168.178.53";
-          user = "yoda";
+          user = "${user}";
           port = 22;
           compression = false;
         };
         "yodaEnchilada" = {
           hostname = "192.168.178.25";
-          user = "yoda";
+          user = "${user}";
           port = 22;
           compression = false;
         };
@@ -29,7 +32,7 @@
         # local IP: 192.168.178.186
         "yodaYoga" = {
           hostname = "yodayoga.p1st.de";
-          user = "yoda";
+          user = "${user}";
           port = 2224;
           compression = true;
         };
@@ -48,7 +51,7 @@
 
         "pi3bplus" = {
           hostname = "fckjpbxxim36c1gb.myfritz.net";
-          user = "yoda";
+          user = "${user}";
           port = 22;
           compression = true;
         };
@@ -75,7 +78,7 @@
         # local IP: 192.168.178.118
         "yodaHedgehog" = {
           hostname = "yodahedgehog.p1st.de";
-          user = "yoda";
+          user = "${user}";
           port = 2226;
           compression = true;
         };
@@ -95,7 +98,7 @@
         # local IP: 192.168.178.119
         "yodaNas" = {
           hostname = "yodanas.p1st.de";
-          user = "yoda";
+          user = "${user}";
           port = 2222;
           compression = true;
         };
diff --git a/modules/ssh-server.nix b/modules/ssh-server.nix
index 91aec7d..c0761a4 100644
--- a/modules/ssh-server.nix
+++ b/modules/ssh-server.nix
@@ -1,4 +1,7 @@
 { config, pkgs, ... }:
+let
+  user = config.yoda.user;
+in
 {
   # Enable SSH server.
   services.openssh = {
@@ -47,7 +50,7 @@
 
   # TODO replace authorizedKeys in all .nix files with authorizedKeyFiles
   # SSH public key(s) allowed to connect via SSH.
-  users.users."yoda".openssh.authorizedKeys.keys = [
+  users.users."${user}".openssh.authorizedKeys.keys = [
     (builtins.readFile ../assets/ssh/nitrokey.pub)
   ];
   users.users."root".openssh.authorizedKeys.keys = [
diff --git a/modules/thunderbird.nix b/modules/thunderbird.nix
index e8d5c9b..81e0680 100644
--- a/modules/thunderbird.nix
+++ b/modules/thunderbird.nix
@@ -1,6 +1,9 @@
 { config, pkgs, lib, ... }:
 let
-  user = config.yoda.user;
+  user        = config.yoda.user;
+  name        = config.yoda.name;
+  email       = config.yoda.email;
+  fingerprint = config.yoda.fingerprint;
 
   # TODO: trim whitespaces from string
   email-uni-marburg = (builtins.readFile ../secrets/email-uni-marburg);
@@ -13,16 +16,16 @@ in
   home-manager.users."${user}" = { osConfig, config, pkgs, ... }: {
     accounts.email.accounts = {
       "personal" = {
-        address = "daniel@systemli.org";
+        address = email;
         gpg = {
           # The key to use as listed in gpg --list-keys.
-          key = "94F3D3DDAC22802258FC044B6C47C753F0823002";
+          key = fingerprint;
           signByDefault = true;
         };
         primary = true;
-        realName = "Daniel Langbein";
+        realName = name;
 
-        userName = "daniel@systemli.org";
+        userName = email;
         imap = {
           host = "mail.systemli.org";
           port = 993;
@@ -39,7 +42,7 @@ in
       "uni-marburg" = {
         address = email-uni-marburg;
         primary = false;
-        realName = "Daniel Langbein";
+        realName = name;
 
         # It seems as if both is possible:
         #   userName: part of email before "@"
diff --git a/modules/uni-vpn.nix b/modules/uni-vpn.nix
index 328b34e..7f83b1e 100644
--- a/modules/uni-vpn.nix
+++ b/modules/uni-vpn.nix
@@ -1,4 +1,7 @@
 { config, pkgs, ... }:
+let
+  user = config.yoda.user;
+in
 {
   assertions = [{
     assertion = config.services.xserver.desktopManager.gnome.enable || config.services.desktopManager.plasma6.enable;
@@ -9,7 +12,7 @@
     ./t-telesec.nix
   ];
 
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       networkmanager-openconnect # Openconnect VPN
     ];
diff --git a/modules/usb-mtp-ptp.nix b/modules/usb-mtp-ptp.nix
index 7b4d989..6fc43b2 100644
--- a/modules/usb-mtp-ptp.nix
+++ b/modules/usb-mtp-ptp.nix
@@ -1,4 +1,7 @@
 { config, pkgs, ... }:
+let
+  user = config.yoda.user;
+in
 {
   # USB MTP and PTP support
   # https://wiki.archlinux.org/title/Media_Transfer_Protocol#File_manager_integration
@@ -11,7 +14,7 @@
   programs.gphoto2.enable = true;
   # To grant digital camera access to a user,
   # the user must be part of the camera group:
-  users.users."yoda".extraGroups = ["camera"];
+  users.users."${user}".extraGroups = ["camera"];
   #
   # Example usage:
   #
diff --git a/modules/veracrypt.nix b/modules/veracrypt.nix
index ad50715..4097bd6 100644
--- a/modules/veracrypt.nix
+++ b/modules/veracrypt.nix
@@ -1,4 +1,7 @@
 { config, pkgs, lib, ... }:
+let
+  user = config.yoda.user;
+in
 {
   # Looks as if TrueCrypt is unfree software
   #   https://github.com/NixOS/nixpkgs/blob/5d017a8822e0907fb96f7700a319f9fe2434de02/pkgs/applications/misc/veracrypt/default.nix#L59
@@ -11,7 +14,7 @@
     "veracrypt"
   ];
 
-  users.users."yoda" = {
+  users.users."${user}" = {
     packages = with pkgs; [
       veracrypt # Encrypted filesystem
     ];
diff --git a/modules/zsh.nix b/modules/zsh.nix
index 143d67b..7f65720 100644
--- a/modules/zsh.nix
+++ b/modules/zsh.nix
@@ -1,5 +1,7 @@
 { config, pkgs, ... }:
 let
+  user = config.yoda.user;
+
   # https://nixos.wiki/wiki/Zsh
   zsh-config = {
     enable = true;
@@ -57,9 +59,9 @@ in
 
   # Inside the following Home Manager configuration block,
   # `config` refers to Home Manager configuration.
-  home-manager.users."yoda" = { osConfig, config, pkgs, ... }: {
+  home-manager.users."${user}" = { osConfig, config, pkgs, ... }: {
     programs.zsh = zsh-config // {
-      # nix-repl: config.home-manager.users."yoda".programs.zsh.history.path
+      # nix-repl: config.home-manager.users."${user}".programs.zsh.history.path
       # -> ~/.local/share/.histfile
       history.path = "${config.xdg.dataHome}/.histfile";
     };