Can’t turn off post notifications?

My husband had been using my account (since he got locked out of his device after our home caught fire) and was trying to contact Jason to update/change his password because he never signed out of his account and so had forgotten it. Somehow he must have subscribed to post notifications where he’d been posting using “clararox” and I’m still receiving them in my email even after he has stopped using my account. There aren’t any settings that I can find to turn them off. Should I just change the email for this account to his?

You could always just have your gmail or whatever block emails from theremin world. I don't know if that is what you are looking for but if you can't find anything else I'm sure it will work.