diff --git a/email.nix b/email.nix
index 9d31e92..3e36778 100644
--- a/email.nix
+++ b/email.nix
@@ -21,6 +21,10 @@
       "abuse@eurofusion.eu" = "rnhmjoj@eurofusion.eu";
     };
 
+    # store state under /var
+    mailDirectory    = "/var/lib/mail";
+    dkimKeyDirectory = "/var/lib/dkim";
+
     mailboxes = {
       # default IMAP folders
       Sent   = { specialUse = "Sent";   auto = "subscribe"; };