What does HackerNews think of reserved-usernames?

590+ usernames in this dictionary! A list of reserved usernames to prevent url collision with resource paths. This repository hosts the list in multiple formats like JSON, CSV, SQL and plain text. You can use its just download its by wget.

Language: PHP

It's a common security practice, to prevent scammers from using official-looking usernames, or even tricking services that verify domain ownership by sending email to postmaster@ or admin@.

Such lists are usually kept secret, but there are a few open source word lists that people can adopt for their services, for example, https://github.com/shouldbee/reserved-usernames.