It would be handy (for me) if there were a userdb where a directory
structure defined the db.
userdb stat {
mail_location=maildir:/fakedir/%d/%n:INBOX=/email/%d/%n:LAYOUT=fs
}
userdb stat {
mail_location=maildir:/email/%d/%n:INBOX=/email/%d/%n:LAYOUT=fs
}
The idea being that if the first directory doesn't exist then it will
try the second one.