pull nixos-mailserver module into this repo

nixos-mailserver/pkg-postfixadmin.nix

@@ -0,0 +1,35 @@
+{ stdenv, lib, fetchFromGitHub, config ? null, cacheDir ? null }:
+
+stdenv.mkDerivation rec {
+  name = "postfixadmin-${version}";
+  version = "3.3.10";
+  rev = "${name}";
+
+  src = fetchFromGitHub {
+    inherit rev;
+    owner = "postfixadmin";
+    repo = "postfixadmin";
+    sha256 = "0xck6df96r4z8k2j8x20b8h2qvmzyrfsya82s4i7hfhrxii92d3w";
+  };
+
+  phases = [ "unpackPhase" "installPhase" ];
+
+  installPhase = ''
+    cp -Rp ./ $out/
+    ${lib.optionalString (config != null) ''
+      ln -s ${config} $out/config.local.php
+    ''}
+    ${lib.optionalString (cacheDir != null) ''
+      ln -s ${cacheDir}/templates_c $out/templates_c
+    ''}
+  '';
+
+  meta = with lib; {
+    description = "Postfix Admin";
+    homepage    = http://postfixadmin.sourceforge.net/;
+    license     = licenses.gpl2;
+    maintainers = with maintainers; [ tokudan ];
+    platforms   = platforms.all;
+  };
+}
+