XF 1.4 Limit the number of emails for watched threads


Is there a way to limit the number of emails sent to users for the threads that they are watching.
For example no more than 2 per day?
I becomes easily overwhelming and many don't know how to unsbscribe from a thread.

I don't, I receive as many emails as there are messages posted for some reason. No kidding, that suprpised me today when I received 2 emails for the same thread while I was away without internet access today.
That's pretty much why I was asking. I thought that there was only 1 email too. Weird, I'll check again...