Check usernames for reserved email addresses, subdomains, or Unix usernames.
When you let users of a webapp create their own usernames, and this name is used in an email address or Unix user, it is important to check against some common usernames, like ‘root’, ‘postmaster’, and ‘postfix’. This library is an attempt for that.
You should check the following:
License: BSD 2-clause
Image via xkcd.com