You can do this with any email provider that supports a catchall. I personally use fastmail and have been very happy with it. You don't need to 'create' the acc

You can do this with any email provider that supports a catchall. I personally use fastmail and have been very happy with it. You don't need to 'create' the accounts, you just set it up so that *@yourdomain.com goes to your catchall. When signing up for a new service, you pick a unique/random email. Then you know unambiguously where each email in your inbox came from. I personally use the website as the email (example, if HN required an email it would be hn@mydomain.com) to make it easier to filter. But this can be gamed/guessed, to be more secure it is better to generate an actual random email for each site and store it in your password manager.