[Dovecot] [ #14832]: Capital letters in POP3 logins

[support at majordomo.ru]

Hello all!
I'm newbie here :)
Using dovecot (version 1.0-test59, with mysql-auth) I saw strange problem:
after authentication by POP3 in case that username given has capital letters, for example SupportTeam at majordomo.ru,
dovecot creates new maildir 'SupportTeam' for this username instead reading mails from existing maildir 'supportteam'.
Then dovecot scans created maildir 'SupportTeam' and returns 0 messages (sure:). 
IMAP4 works fine in the same time.

Can I solve this problem or it is virtually "bug" of dovecot?
Thanks in advance!

Vladimir