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List of reserved names to blacklist from registration/username claim for security reasons and RFC compliance
abuse
admin
administrator
ftp
hostmaster
info
is
it
list
list-request
majordomo
marketing
mis
press
media
news
noc
postmaster
root
sales
security
ssl-admin
ssladmin
ssladministrator
sslwebmaster
support
sysadmin
trouble
usenet
uucp
webmaster
www
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