Plugin broadcast error

I need a plugin for mass notification to the customer.
but with the plugin “Broadcast” having problems:
originally staged server 3.8.2 - but the list of available plug-ins it is not!
upgrade the server to 3.9.0 and 3.9.3 - in both cases there is a plugin, but after installation in the list of installed plug-ins do not appear.
configuration files are present.

Create a group accessible to all "Mailing lists"
it added non-existent users of the form:
where admins - the group that I want to notify,
MyDomain - my domain

however - Mailing not occur

This plugin does not work? or am I doing something wrong?


the question is removed - the problem is java version of the curve