1. Log into https://account.riseup.net
2. Click on the "Close account" button
3. Re-enter your password and click the red "Close account" button
That's all. The e-mail account is closed and the data purged.
Note: When you do this process your username will enter a "reserved" state. This means nobody, including you, will be able to use that username again.
Note: When you do this process your username will enter a "reserved" state. This means nobody, including you, will be able to use that username again.