Short of us getting an email bounced back to us there is no way for us to tell if an email address had ceased to exist.
aislin
I just discovered a new problem as to why there might be inactive members on the forum. Maybe they have this account on an email they don't use as frequently, maybe they forgot their username, maybe they didn't remember that they still had an account here, or maybe they get confused as to what all their passwords are and have to reset it. I just reset mine a second time. It can get confusing keeping track of them all. Hopefully, I'll remember my new password this time. If not, I can always reset it again.