This is the a module used in the Mail to ticket automation extension for iTop.
For more information about this module have a look at the corresponding extension documentation.
Release packages can be found on the iTop Hub Store. This is the best way to get a running package as those contains all the needed modules and stable code.
When downloading directly from GitHub (by cloning or downloading as zip) you will get potentially unstable code, and you will miss additional modules.
This iTop module development is sponsored, led and supported by Combodo.