diff --git a/pkgs/by-name/mj/mjmap/package.nix b/pkgs/by-name/mj/mjmap/package.nix
new file mode 100644
index 0000000000000..8751757fb5686
--- /dev/null
+++ b/pkgs/by-name/mj/mjmap/package.nix
@@ -0,0 +1,42 @@
+{
+  lib,
+  buildGoModule,
+  fetchFromSourcehut,
+  unstableGitUpdater,
+}:
+
+buildGoModule {
+  pname = "mjmap";
+  version = "0.1.0-unstable-2023-11-13";
+
+  src = fetchFromSourcehut {
+    owner = "~rockorager";
+    repo = "mjmap";
+    rev = "d54badae8152b4db6eec8b03a7bd7c5ff1724aa7";
+    hash = "sha256-yFYYnklNNOHTfoT54kOIVoM4t282/0Ir4l72GmqlGSY=";
+  };
+
+  vendorHash = "sha256-fJuPrzjRH0FpYj2D9CsFdsdzYT0C3/D2PhmJIZTsgfQ=";
+
+  installCheckPhase = ''
+    runHook preInstallCheck
+
+    $out/bin/mjmap --version >/dev/null
+
+    runHook postInstallCheck
+  '';
+
+  passthru.updateScript = unstableGitUpdater {
+    tagPrefix = "v.";
+  };
+
+  meta = {
+    description = "Sendmail‐compatible JMAP client";
+    homepage = "https://git.sr.ht/~rockorager/mjmap";
+    license = lib.licenses.mpl20;
+    sourceProvenance = [ lib.sourceTypes.fromSource ];
+    maintainers = [ lib.maintainers.emily ];
+    mainProgram = "mjmap";
+    platforms = lib.platforms.unix;
+  };
+}