diff --git a/.sops.yaml b/.sops.yaml
index bf35e44..637cf45 100644
--- a/.sops.yaml
+++ b/.sops.yaml
@@ -13,9 +13,18 @@ keys:
       - &admin_gpg_lilly D2E9C0807BF681F5E164DAFC5EE1B61CD90954CD
       - &admin_gpg_langoor 878FEA3CB6A6F6E7CD80ECBE28506E3585F9F533
   hosts:
-    age:
-      - &host_netbox_ansible_pull_age_key age1ss82zwqkj438re78355p886r89csqrrfmkfp8lrrf8v23nza492qza4ey3
+    chaosknoten:
+      age: &host_chaosknoten_age_keys
+        - &host_netbox_ansible_pull_age_key age1ss82zwqkj438re78355p886r89csqrrfmkfp8lrrf8v23nza492qza4ey3
 creation_rules:
+  # group vars
+  - path_regex: inventories/chaosknoten/group_vars/all.*
+    key_groups:
+      - pgp:
+          *admin_gpg_keys
+        age:
+          *host_chaosknoten_age_keys
+  # host vars
   - path_regex: inventories/chaosknoten/host_vars/cloud.*
     key_groups:
       - pgp:
@@ -70,6 +79,7 @@ creation_rules:
     key_groups:
       - pgp:
           *admin_gpg_keys
+  # general
   - key_groups:
       - pgp:
           *admin_gpg_keys
diff --git a/inventories/chaosknoten/group_vars/all.sops.yaml b/inventories/chaosknoten/group_vars/all.sops.yaml
new file mode 100644
index 0000000..4cccea4
--- /dev/null
+++ b/inventories/chaosknoten/group_vars/all.sops.yaml
@@ -0,0 +1,210 @@
+msmtp__smtp_password: ENC[AES256_GCM,data:xcBVBTb6mfr5Ubyfga9ibKWKhrfrEEaDWD98vIbX8fl8lQ4YTovg8Ax1HTK4UQ6AkJGHq2A0D5B67KUTlp9eLw==,iv:TOp1G1LktRPj/KMCRU5CXBUsgKOqGssUvvk5oY0QnPM=,tag:SVBdDQy+fM0xeEToappP+A==,type:str]
+sops:
+  age:
+    - recipient: age1ss82zwqkj438re78355p886r89csqrrfmkfp8lrrf8v23nza492qza4ey3
+      enc: |
+        -----BEGIN AGE ENCRYPTED FILE-----
+        YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBsemRxOVROLytjZ0NJazJB
+        UnRWTmNvb0JxUnhWMGJTOTl2ZVpyYmxZbUdVCnorcTgyY1pNVzNnVWYwNkFITEZl
+        RmxrZUN4V1BRenBISDVBZ0hVelVqU0kKLS0tIDQ4QlFMajNXQzRDVWd2Skl6QkdK
+        dEZGZ21qR2ZWT21OYi8rR0svaWJkU2sKND8yz4CSMVjWtGHymzD26Nxlk6leEkCD
+        XYpGJSyvhaw6Y/oExjzuXYMDXCr/EQFpM8wpU00YA62rZ34FBsyoUA==
+        -----END AGE ENCRYPTED FILE-----
+  lastmodified: "2025-10-13T23:45:06Z"
+  mac: ENC[AES256_GCM,data:QxH4lnNyCAAEJhzbgCrq7QeLs+OAtYgwQP4oFm93NE4Fbz7/Hz2dvL/2SopOdW7nYVeb1scuG1ra+yvgzuQDhg4lcgt9eBJoBiynM3qiHBs+FtcSJoKs16I/ACAadQwClALb4E0xxwKFJI8ewMZu5BAxi5EhYbgNfnKCIbhvgWo=,iv:LRa2vX0HUBugeEAVeOqXbPsMQrfrCpyzGUGjK6+VaQc=,tag:/sfhJM8V1IYBh94ZS/TDxQ==,type:str]
+  pgp:
+    - created_at: "2025-10-13T23:43:50Z"
+      enc: |-
+        -----BEGIN PGP MESSAGE-----
+
+        hQIMAxK/JaB2/SdtAQ/9Hx48AvlY9g+JVcwqC399JS62WOMmswvmqJIStHCVCEJN
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+        A78U30BUM+asmgg5MaF+9pxuNDnt/kBXf9VjiElU0XOoIoyTZuVSNtJKxcaTim+g
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+        7zTsME/nRZpnCSZb97nqGsb6tnhnQLnSCwagmVRtJVi3N60TnxAm6ulizbzTLt8=
+        =d44L
+        -----END PGP MESSAGE-----
+      fp: EF643F59E008414882232C78FFA8331EEB7D6B70
+    - created_at: "2025-10-13T23:43:50Z"
+      enc: |-
+        -----BEGIN PGP MESSAGE-----
+
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+      fp: F155144FC925A1BEA1F8A2C59A2A4CD59BFDC5EC
+    - created_at: "2025-10-13T23:43:50Z"
+      enc: |-
+        -----BEGIN PGP MESSAGE-----
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+      fp: 18DFCE01456DAB52EA38A6584EDC64F35FA1D6A5
+    - created_at: "2025-10-13T23:43:50Z"
+      enc: |-
+        -----BEGIN PGP MESSAGE-----
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+        1kjta3TimXnGVGYzt8KTAmkdhChU0LeM3MBvF8/IVuHOyYkf4sN8Mfqoy7YFca4Z
+        UVw/rvMYRgy4ORMsIDg/ucDoPsF/oPnionQIXmY5GMVsV0VzYuWVP9Mt48+W8InS
+        XgH7xkrrQno8PqHaPc5C11eJFBxw/p92vp4Y0BwBQzcmt6sfO/kLFYO6FdQ9EQIX
+        7ncs9anVdF8Hcy44N+6u0eA1GY5IulkHbsulvW2xek7wT4IqWC6tMwVrWrpq35Q=
+        =qx+H
+        -----END PGP MESSAGE-----
+      fp: 878FEA3CB6A6F6E7CD80ECBE28506E3585F9F533
+  unencrypted_suffix: _unencrypted
+  version: 3.10.2
diff --git a/inventories/chaosknoten/group_vars/all.yaml b/inventories/chaosknoten/group_vars/all.yaml
index d6cd2ce..3612ebc 100644
--- a/inventories/chaosknoten/group_vars/all.yaml
+++ b/inventories/chaosknoten/group_vars/all.yaml
@@ -5,3 +5,11 @@ ansible_pull__inventory: inventories/chaosknoten
 ansible_pull__playbook: playbooks/maintenance.yaml
 ansible_pull__timer_on_calendar: "*-*-* 04:00:00 Europe/Berlin"
 ansible_pull__timer_randomized_delay_sec: 30min
+
+# msmtp
+# msmtp__smtp_password is defined in the all.sops.yaml.
+msmtp__smtp_host: cow.hamburg.ccc.de
+msmtp__smtp_port: 465
+msmtp__smtp_tls_method: smtps
+msmtp__smtp_user: any@hosts.hamburg.ccc.de
+msmtp__smtp_from: "{{ inventory_hostname }}@hosts.hamburg.ccc.de"