I have a catch all domain and regret it. I have a four letter TLD (idoh.com naturally) and not a day goes by where I don't catch splash damage from someone who

I have a catch all domain and regret it. I have a four letter TLD (idoh.com naturally) and not a day goes by where I don't catch splash damage from someone who made a typo or plugged in a fake email address somewhere. Twitter, for example, seems to allow people to make accounts with unverified email addresses, and lately I've been getting password reset requests from a twitter user who plugged in some-japanese-name@idoh.com as their email address for Twitter. Sometimes I get emails from, e.g., a vet's office, or some local cubs scout group. I've tried telling people that they got the wrong email address, but no way of explanation succeeds in getting people to understand that someone put down the wrong email address.