Well, for a few pounds a year you can register a domain. I have mine at Fasthosts and they will forward all mail to that domain to a chosen address (in my case

Well, for a few pounds a year you can register a domain. I have mine at Fasthosts and they will forward all mail to that domain to a chosen address (in my case a Gmail). You can then use anything @your.host and it will come to you. Gmail can do the kind of filtering you plan to offer. A problem with that is that some sites like GitHub run a check to see if you have a real inbox (no idea what that entails) and reject your made up address. You need to consider that. Otherwise that is your tricky to set up alternative. Most non technical folks couldn't do all that.