On Fri, 2006-01-20 at 00:23 +1100, John Francis wrote: > On 19/01/06, Tim <ignored_mailbox@xxxxxxxxxxxx> wrote: > > On Thu, 2006-01-19 at 19:18 +1100, John Francis wrote: > > > I have two users on the box: userone and UserTwo (note the mixed case > > > in the latter). > > > > > > Sending mail to userone works fine, but not so with UserTwo. > > > > There are warnings against doing such things (using capital letters in > > mail addresses), and for good reason. You've struck one problem, how > > many more do you want to have to solve? Your best solution is to stop > > wanting do to that. > > > > I've only ever used lcase usernames myself out of habit. Also, in > this case it will be quite easy for me to get the usernames changed. > But the question still remains: why should it be a problem? > > I understand that the domain part of an email address should be case > insensitive, but where does it say that about the local-part? In > fact, RFC 2821 states that the local-part should be treated as case > sensitive. > There are mail systems that are not case sensitive. However, any *nix system is case sensitive. It is possible to have UserOne and userone ... They are distinctly different user names, but would be very confusing to anyone looking at them AND the system sees them as distinct. > Most MTAs don't strictly enforce this and try to treat the local-part > case insensitively. This means that whether I send it to usertwo or > UserTwo or USERTwo, it should (by convention, in non-compliance with > the RFC) go to the same mailbox. > > It appears that this is in fact what happens in Postfix. To avoid > confusion it just lcases the local-part and attempts delivery. > And thus breaks it if the actual user name is not all lower case. In my example above all mail would be delivered to userone. UserOne would never receive his mail if Postfix does the trick you describe. > Hmm... I think I've just answered my own question. For Postfix to be > able to deliver in the case where the mailbox name is UserTwo and is a > Unix account, it would first need to look for a match with every > combination of each character in ucase an lcase. Not very practical. > > This is an issue with Unix accounts because usernames are > case-sensitive, but I whether that is the case with Cyrus-IMAPd. > To me how it is handled is immaterial. I set all user names to only lower case to avoid this type of problem. > -- > Kind regards, > > John Francis >
