[CentOS] E-mail advice sought

[Leon Fauster]

Am 01.05.2016 um 06:43 schrieb Alice Wonder <alice at domblogger.net>:
> On 04/30/2016 08:56 PM, Gordon Messmer wrote:
>> On Sat, Apr 30, 2016 at 12:44 PM, Alice Wonder <alice at domblogger.net> wrote:
>>> 
>>> 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.
>> 
>> 
>> That's not how the RFC rules are defined.  But, rather than argue that
>> point at length, I'd point out that Open Group standards for usernames
>> are simple and will comply with the SMTP RFCs:
>> http://pubs.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap03.html#tag_03_426
>> 
>> That is, [A-Za-z0-9._][A-Za-z0-9._-]
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>> https://lists.centos.org/mailman/listinfo/centos
>> 
> 
> I think there is a mis-understanding.
> 
> All I was looking for was if there was a common set of characters typically blasted from new usernames *on the domain being set up*
> 
> I have no desire to refuse delivery to any valid e-mail address.
> 
> For example, avoiding spaces in usernames for addresses on the system is handy because it avoids bugs where the path to the mailbox on the filesystem isn't properly quoted.
> 
> So user names on the system won't be allowed to have spaces even though they are legal when within quotes or escaped.
> 
> That's all I was looking for, was experience on what legal characters to avoid allowing users to have for the mailbox portion of their e-mail address, the username.
> 
> Of course I have no desire to restrict who they can send to if it is a legal address.


blacklisting is not a good practice, use the suggested whitelist ...

--
LF