{ lib, python, buildPythonPackage, fetchFromGitHub, libmilter, bsddb3, pydns, iana-etc, libredirect }:

buildPythonPackage rec {
  pname = "pymilter";
  version = "1.0.5";

  src = fetchFromGitHub {
    owner = "sdgathman";
    repo = pname;
    rev = "${pname}-${version}";
    hash = "sha256-gZUWEDVZfDRiOOdG3lpiQldHxm/93l8qYVOHOEpHhzQ=";
  };

  buildInputs = [ libmilter ];
  propagatedBuildInputs = [ bsddb3 pydns ];

  preBuild = ''
    sed -i 's/import thread/import _thread as thread/' Milter/greylist.py
  '';

  # requires /etc/resolv.conf
  # testpolicy: requires makemap (#100419)
  #   using exec -a makemap smtpctl results in "unknown group smtpq"
  preCheck = ''
    echo "nameserver 127.0.0.1" > resolv.conf
    export NIX_REDIRECTS=/etc/protocols=${iana-etc}/etc/protocols:/etc/resolv.conf=$(realpath resolv.conf)
    export LD_PRELOAD=${libredirect}/lib/libredirect.so
    sed -i '/testpolicy/d' test.py
    rm testpolicy.py
  '';

  pythonImportsCheck = [ "Milter" ];

  meta = with lib; {
    homepage = "http://bmsi.com/python/milter.html";
    description = "Python bindings for libmilter api";
    maintainers = with maintainers; [ yorickvp ];
    license = licenses.gpl2;
  };
}