diff --git a/systems/x86_64-linux/prefect/services/mailserver/default.nix b/systems/x86_64-linux/prefect/services/mailserver/default.nix
index 591a9a44..2fef8a08 100644
--- a/systems/x86_64-linux/prefect/services/mailserver/default.nix
+++ b/systems/x86_64-linux/prefect/services/mailserver/default.nix
@@ -37,8 +37,6 @@
     ];
 
     # DKIM Settings
-    dkimBodyCanonicalization = "relaxed";
-    dkimHeaderCanonicalization = "relaxed";
     dkimKeyBits = 4096;
     dkimSelector = "mail";
     dkimSigning = true;