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 ... -- LF