Hi modelcrazy!
I'm just a 'helpful fly on the wall here' asking this, but can relate to the frustration of expecting to be notified about something, yet not receiving that notification (and especially if those notifications used to work before). Are you able to recall which action was supposed to trigger your email notification? Perhaps some specifics like the specific forum name or link are helpful for the process of getting those notifications working again. For example, a few minutes ago, I was able to trigger an email notification from this site to reset my password, and the email came from "noreply@finescale.com" to allow me to reset my password.
Thanks!