[Dovecot] Problem with different case logins

Hi,

we have a system (Debian sarge) that uses LDAP for user

authentication, via pam. We also have virtual users by using a static userdb [1], using the directory structure /var/lib/dovecot/postoffice/%u (i.e., a directory under /var/lib/dovecot/postoffice with the name of the user). The directory /var/lib/dovecot/postoffice belongs to postoffice:mail. IMAP folders, indexes and stuff go here; normal mail goes into /var/mail/%u. We are using dovecot 1.0alpha3 (upgrading to alpha4 soon).

Today we've found a grave problem. Let's suppose you have the login

"mylogin.domain.com". If you instead use the login "MYLOGIN.domain.com", the authentication works anyway (which is Ok), but dovecot creates a new directory under /var/lib/dovecot/postoffice with the different case, i.e., /var/lib/dovecot/postoffice/MYLOGIN.domain.com (which is not Ok). Afterwards, you can only access this new folder if you use the login with the caps. A new file (we're using mbox) under /var/mail/ with the new name is also created, though I don't understand yet how. We're using Postfix as MTA, and it always delivers to the lower case name.

I hope you can understand the problem. If an user logs with a name

with just one letter changed from lower case to upper case, all his/her folders and mail will be seemingly gone.

Is this a bug or a feature? If the latter, is it possible to change

this behaviour, or at least work around it?

Thanks in advance.

-- Roberto Suarez Soto Allenta Consulting robe@allenta.com www.allenta.com