I’ve put together a tool for testing servers for the presence on DNS based mail block lists. We have a few mail servers under our management. On occasion it’s nice to be able to check for their presence on various DNS block lists. My goal is to have a Nagios check plugin as well as command line tool to perform lookups. The first crack at it can be installed as a ruby gem or or found in the rebbler github respository.

In addition to the command line interface and Nagios check functionality it can be run as a web server making use of the Sinatra micro framework.

Feel free to install:

gem install rebbler

And run it:

rebbler 156.12.1.148

Or run the server:

rebbler -s

And visit http://localhost:4567/