diff --git a/flake.nix b/flake.nix
index 44ba009..9e2dc04 100644
--- a/flake.nix
+++ b/flake.nix
@@ -58,6 +58,7 @@
         overlays/mautrix-discord.nix
         overlays/getmail6
         overlays/maildrop
+        overlays/courier-unicode.nix
       ];
 
       flake.nixosModules = {
diff --git a/overlays/courier-unicode.nix b/overlays/courier-unicode.nix
new file mode 100644
index 0000000..d000cdb
--- /dev/null
+++ b/overlays/courier-unicode.nix
@@ -0,0 +1,25 @@
+{ lib, ... }:
+let
+  inherit (lib)
+    singleton;
+
+  pname = "courier-unicode";
+  version = "2.2.6";
+in
+{
+  flake.overlays.courier-unicode =
+    final: prev:
+    {
+      courier-unicode =
+        prev.stdenv.mkDerivation rec {
+          inherit pname version;
+
+          src = prev.fetchurl {
+            url = "mirror://sourceforge/courier/courier-unicode/${version}/${pname}-${version}.tar.bz2";
+            sha256 = "sha256-UT9oBm7RkqzmMPYBmExWW1wdHIHZjGR46+Tts6Fb4Do=";
+          };
+
+          nativeBuildInputs = singleton prev.perl;
+        };
+    };
+}