Re: "muat have missed a random site in the early days."
"As lots of companies want a more private one. I need a public, private, personal, and then company independent and/or throw away ones. Looks like there is a hole in the market for a product there!"
It's a market niche but not a hole as there are several mail service providers who will provide domain and email hosting facilities. Just set up a series of addresses all forwarding to one inbox. Make some long term use case specific (bank, family and friends etc.) and a throw away one that runs for a few weeks and then gets torn down.