Hostnames and usernames to reserve

If you're setting up a service where people can register their own usernames to be used as a hostname (username.example.com), email address (username@example.com), or URL path (example.com/username) within your domain, there are some common names you should avoid letting the general public register. Many Internet protocols make the assumption that a domain is manually managed by its owners, and in

[ymkjp]

"Hostnames and usernames to reserve"

[tmatsuu]

ホスト名やメールアドレス、URLなどでユーザーに使わせるべきではない予約語集。良い。

[fcicq]

Hostnames and usernames to reserve