I'm currently developing a Google Apps Script that modifies the settings of all groups of a domain, but the settings applied depend on the group type (i.e. email list or collaborative inbox, mostly).
However, I've not found a way to determine the group type using the Google APIs (I'm using the "Groups Settings API" and the "Directory API: Groups").
Does anyone know how to get the group type using the Google APIs, or any other programmatic way ?