Automatically subscribe users to each interaction they do

Hello, is there a way to automatically subscribe users to each interaction they do in the Easydiscuss Forum? Example:

1 - If they post a new question, and somebody answer it, so the user get an email to inform he got new message.

2 - If they answer someone question, they automatically receive a email to inform any new message there also.

3 - Also we want to create a menu Link to allow user direct access to all participation he made in forum... for New Topics he post, also for any answer he make in someone topic. So doing that, in just one link he will be able to follow all activities he made there. Is it possible?

With Best Regards
Bruno Alecrim