If your email provider does not offer a catchall alias option, this is also achievable with an email forwarder (e.g. mailgun), provided you are ok with giving another service provider access to the content of your received mails.

Technically most email is not encrypted so every single mail server in the middle also has access.

If only it were possible to encrypt emails, oh well

> So, instead of doing [email protected], I can do [email protected].

Fastmail has an interesting variation of this that supports multiple users on the same domain: [email protected]. My wife and I both use that feature heavily on our domain.