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.
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
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.
On Sun, 2016-05-01 at 10:57 +0200, Leon Fauster wrote:> blacklisting is not a good practice, use the suggested whitelist ...I disagree from practical experience. My Exim mail servers (MTAs) refused connections from 'amateur' mail senders such as:- *dynamic.163data.com.cn *airtelbroadband.in *adsl.alicedsl.de *dynamic.se.alltele.net *alshamil.net.ae *adsl.anteldata.net.uy *aphie.info *pools.arcor-ip.net *static.arcor-ip.net *as9105.com *as13285.net *as43234.net et cetera and from professional spammers *compute.amazonaws.com *isp.att.net *bmsend.com *chtah.com *chtah.net *descene.org *dmdelivery.com *dnsinspect.com *edmspread.com *emsmtp.com *emsmtp.us *everydayedeals.com et cetera My philosophy is not to be a willing victim of spam and other unwanted time-wasting junk. It is only when concerned citizens like Alice (in) Wonder(land) critically re-examine the status quo, and the justification for it, that things may improve. Mankind never advances when there is no questioning of established practises. -- Regards, Paul. England, EU. England's place is in the European Union.