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Buy a domain privately with BTC and set-up 21 email aliases.
You don't have to set up specific email aliases. I would recommend combining your new domain with SimpleLogin and allow that to manage your aliases. They have good browser extensions to help with that. You could also enable "Auto create/on the fly alias":
Simply use anything@yourdomain.com next time you need an alias: it'll be automatically created the first time it receives an email. To have more fine-grained control, you can also define auto create rules .