rbldnsd is a small authoritative-only DNS nameserver designed to serve DNS-based blocklists (DNSBLs).
The current source tree is mantained by The Spamhaus Project Ltd.
The original source was written originally by Michael Tokarev firstname.lastname@example.org
The current source and documentation can be found at https://rbldnsd.io/
The original, unmantained source and debian packages can always be found at http://www.corpit.ru/mjt/rbldnsd.html
Copyright (C) 2016-2021 The Spamhaus Project Ltd. Copyright (C) 2002 Michael Tokarev
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.