Wrbldnsd - Rbldnsd for Windows

Wrbldnsd is a windows-based anti-spam solution by serving DNSBL zones locally. It is a packaging of rbldnsd, rsync, ssh and cygwin. You can use wrbldnsd to locally mirror DNSBL zone files, thus eliminating latency problems in larger environments and decreasing time used for email filtering significantly.

Rbldnsd is a small and fast DNS daemon which is especially engineered for serving DNSBL zones. It can serve both IP-based and name-based blocklists. All zones are kept in memory for faster performance with a decent memory footprint.  Rsync uses the Rsync algorithm which provides a very fast method for bringing remote files into sync. It does this by sending just the differences in the files across the link, without requiring that both sets of files are present at one of the ends of the link beforehand. Cygwin is a Linux-like environment for Windows. It consists of a DLL, which emulates substantial Linux API functionality, and a collection of tools.  


  Supported platforms : Windows 2000/XP/2003/Vista/2008/7/2012/10/2016

Wrbldnsd comes as a ZIP file containing an NSIS installer. Simply unzip your downloaded copy and run the package "wrbldnsd_x.x_Installer.exe" :

  1. Accept License agreement.
  2. Specify an installation location.
  3. Specify a service account.
  4. Specify IP-address and port number which rbldnsd will listen to, and the list of zone:dataset mappings
  5. Installation starts. By clicking 'Details' button, you can get more detailed information about installation. Check if everything seems ok.


You may check user forum archive for help if you experience problems. Man page for rbldnsd is available here.

You're DONE! Wrbldnsd is installed and the rbldnsd portion is activated as a service.


This package contains components with different terms of licensing:

Component Version Licensing
Rbldnsd 0.998b Rbldnsd license contact Itefix for sources
Cygwin and GNU tools 2.10.1 CYGWIN license contact Itefix for sources
Rsync 3.1.3 Rsync license contact Itefix for sources
Wrbldnsd (the rest) 4.0.0 Itefix EULA

Wrbldnsd - Rbldnsd for Windows


The product is a bundle containing installers for 32- and 64-bit systems.

Quantity is the number of computers to install the product on.

1-year upgrade protection and support is included.