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-rw-r--r--nixos/modules/services/mail/postfix.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/modules/services/mail/postfix.nix b/nixos/modules/services/mail/postfix.nix
index 404cdf0f564b..bad9d527f9a1 100644
--- a/nixos/modules/services/mail/postfix.nix
+++ b/nixos/modules/services/mail/postfix.nix
@@ -27,7 +27,7 @@ let
 
   mainCf =
     ''
-      compatibility_level = 2
+      compatibility_level = 9999
 
       mail_owner = ${user}
       default_privs = nobody