Check from which space the emails are coming.
Open an email , you can see the below details.
The upper highlighted portion is for the space. Press on the lower arrow.
System will take you on the SCN - this discussion/blog/document.
Then check right side in action.
It will be shows "Receive email notification"
Then go to the space, you can see the space link on upper of the discussion/blog/document
Also check there the "Receive email notification" in action tab.
Regards