IMAP with Courier IMAP

[Rony]

I have installed IMAP with  courier-imap-3.0.8  and with QMAIL LDAP wiki
as reference installed Document

at /var/control/bin/dirmaker.sh
#!/bin/sh
#Trash, Drafts y Sent se crean por que 
#normalmente son usadas por clientes IMAP
MAILDIRMAKE=/usr/lib/courier-imap/bin/maildirmake

/bin/mkdir -m 0700 -p $1
$MAILDIRMAKE $1/Maildir
for i in Spam Trash Drafts Sent; do
        $MAILDIRMAKE -f $i $1/Maildir
done

My question
Why Imap do not auto create folder Trash, Draft Sent ??,..Inbox only

and I connect very long ...!!


Soory My english not good because I asian citizen 
Thanks...