On 05/01/2016 05:10 AM, Alice Wonder wrote: > On 05/01/2016 01:57 AM, Leon Fauster wrote: >> 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._-] >>>> _______________________________________________ >>>> CentOS mailing list >>>> CentOS at centos.org >>>> 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 ... > > I think this is my autism coming in to play, I think what is very clear > to me I just am not able to adequately communicate because clearly > people are not even remotely grasping what I am trying to convey. > Basically whether it is a white list or a black list doesn't matter. One is just the complement set of the other. It's the set I'm after. Or its complement. I don't care. Not whether my code should use set A or its complement.