usermin user can browse entire file system

a user logged in under usermin using "manage folders" -> "sent mail" -> "Sent mail file or directory" ->"External mail file or directory" can browse entire file system and select any folder to save sent mail in.
My usermin config is different then install. (becase orig didn't work for users to read mail)
Mail storage format for Inbox- Mail storage format for In box
Sendmail mail file location- File under home directory
Sendmail mail file in home directory- Maildir
Qmail or MH directory location- Subdirectory under home directory
Qmail or MH directory in home directory- Maildir
Mail subdirectory style- Mail subdirectory style
POP3 or IMAP server name- localhost

Status: 
Closed (fixed)