diff --git a/pkgs/servers/mail/spf-engine/default.nix b/pkgs/servers/mail/spf-engine/default.nix
index 0f2e98582514..c90522edf041 100644
--- a/pkgs/servers/mail/spf-engine/default.nix
+++ b/pkgs/servers/mail/spf-engine/default.nix
@@ -2,11 +2,12 @@
 
 buildPythonApplication rec {
   pname = "spf-engine";
-  version = "2.9.3";
+  version = "3.0.4";
+  format = "flit";
 
   src = fetchurl {
     url = "https://launchpad.net/${pname}/${lib.versions.majorMinor version}/${version}/+download/${pname}-${version}.tar.gz";
-    sha256 = "sha256-w0Nb+L/Os3KPApENoylxCVaCD4FvgmvpfVvwCkt2IDE=";
+    sha256 = "sha256-Gcw7enNIb/TrZEYa0Z04ezHUmfMmc1J+aEH6FlXbhTo=";
   };
 
   propagatedBuildInputs = [ pyspf dnspython authres pymilter ];
@@ -17,10 +18,6 @@ buildPythonApplication rec {
     "spf_engine.policyd_spf"
   ];
 
-  postPatch = ''
-    substituteInPlace setup.py --replace "'/etc'" "'$out/etc'"
-  '';
-
   meta = with lib; {
     homepage = "https://launchpad.net/spf-engine/";
     description = "Postfix policy engine for Sender Policy Framework (SPF) checking";