[CentOS] E-mail advice sought

Richard lists-centos at listmail.innovate.net
Sat Apr 30 20:12:15 UTC 2016

------------ Original Message ------------
> Date: Saturday, April 30, 2016 12:44:52 -0700
> From: Alice Wonder <alice at domblogger.net>
> On 04/30/2016 12:22 PM, Gordon Messmer wrote:
>> On 04/30/2016 11:28 AM, Alice Wonder wrote:
>>> Is there any advice on characters to allow in usernames?
>> ...
>>> I don't think a whitelist alphabet is best approach because of
>>> people with names that are not spelled with Latin characters.
>>> Is there an existing blacklist of characters that technically
>>> legal but are generally avoided in e-mail addresses?
>> The RFC uses a list of allowed characters, and so must you.
> For e-mail sent to people, yes.
> But for what usernames are allowed when creating an account, I
> don't see why blacklisting characters that are not allowed in a
> username is a standards problem.

You can set any rules you want for what your local users can use for
their accounts -- within the constraints of the mail RFCs. You just
have to accept mail with and allow your users to send to any RFC
compliant email address.

More information about the CentOS mailing list