: Is there any list of email addresses reserved because of security concerns for any Public Email Service like Gmail / Yahoo? I am in the process of conceiving this idea of a webApp when can

@Heady270

Here is a list of addresses that you may want to treat as reserved:


abuse 1,4
admin 2,3,4
administrator 2,3,4
hostmaster 1,2,3,4
info 1,3
is 3
it 3
list 1
list-request 1
majordomo 4
marketing 1
mis 3
news 1
postmaster 1,2,3,4,5
root 3,4
sales 1
security 1
ssl-admin 4
ssladmin 3
ssladministrator 3
sslwebmaster 3
support 1
sysadmin 3
trouble 1
usenet 1
uucp 1
webmaster 1,2,3,4





Listed in RFC 2142 as a mailbox name for a common purpose
Used by Comodo to issue SSL certificates
Incorrectly used by RapidSSL to issue SSL certificates
Treated as a reserved group name by Google Groups
Listed in RFC 822 -- Standard for ARPA Internet Text Messages as a reserved address


This article suggests that you reserve all mailboxes that start with "admin", "administrator", "webmaster", "hostmaster", or "postmaster". If I were doing that, I would also add "ssl" to my starts with rule. Based on what RapidSSL did, it would make sense to implement an "ends with" rule as well.

RFC 822 also has the reminder that mailboxes are generally case insensitive. You should reserve lower-case, upper-case, and mixed-case versions:


Note: This reserved local-part must be matched without sensitivity to alphabetic case, so that "POSTMASTER", "postmaster", and even "poStmASteR" is to be accepted.

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@Michele947

This might be slightly related list, although its not for Gmail, but for Google Groups for G Suite:
support.google.com/a/answer/6093413?hl=en

Reserved group names:
We reserve certain names that cannot be used if you are creating a group using Google Groups or Google Groups for Business. However, you can use these names if you are creating a group using the Groups control in the Admin console.

abuse
admin
administrator
hostmaster
majordomo
postmaster
root
ssl-admin
webmaster

The names abuse and postmaster are reserved. You can, however, subscribe to them and receive all mail sent to these addresses.

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