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. 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. 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. -- Kind regards, John Francis
