diff --git a/hosts/disk/mail.nix b/hosts/disk/mail.nix
index 3029b19..1a83744 100644
--- a/hosts/disk/mail.nix
+++ b/hosts/disk/mail.nix
@@ -7,5 +7,7 @@ in {
 
   mailserver = {
     inherit fqdn;
+
+    stateVersion = 3;
   };
 }
diff --git a/hosts/nine/mail.nix b/hosts/nine/mail.nix
index 2ba1b2c..dc96dac 100644
--- a/hosts/nine/mail.nix
+++ b/hosts/nine/mail.nix
@@ -10,5 +10,7 @@ in {
 
     # Not [ domain ] because this is a backup mailserver. contact@mail2.rgbcu.be.
     domains = [ fqdn ];
+
+    stateVersion = 3;
   };
 }
diff --git a/modules/mail/default.nix b/modules/mail/default.nix
index 6b81a36..d9538f8 100644
--- a/modules/mail/default.nix
+++ b/modules/mail/default.nix
@@ -47,7 +47,5 @@ in {
 
       hashedPasswordFile = config.secrets.mailPassword.path;
     };
-
-    stateVersion = 2;
   };
 }