setup sdbox per user with userdb

Hi welcome

I want to set some virtual users with sdbox mail_location so I return in password_query and user_query extra field mail which contains sdbox:/var/mail/example.com/user:INDEX=/var/mail_indexes/example.com/user:ALT=/var/mail_altstorage/example.com/user

and then when i send email to user@example.com I see all sdbox dirs created but when i login with thunderbird IMAP - Maildir structure is always created with an empty INBOX

I tried to override namespace inbox with mail AS "namespace/inbox/location" with content sdbox:/var/mail/example.com/user:INDEX=/var/mail_indexes/example.com/user:ALT=/var/mail_altstorage/example.com/user

but nothin change what am I doing wrong?

regards