User notifications

I've been looking at the rest api documents and I can't find anything that fits...

We just launched an internal forum. Our users are getting a lot of emails for their subscribed posts etc ... part of the problem is that our internal community is small so we are just using a top level category for that. So the emails can't be diffrentiated from any they receive from the public customer forum.

Is there any way to show their updates rather than email them? So if we have a widget that shows them with a new message icon or something similar to show that there are updates and list them all?