how to configure ACL right on mailboxes ?

[JOYDEEP]

Dear list,

I am facing a typical problem here with cyrus-imapd-2.2.12-5.

the mail box created by felamimail email interface is automatically have
the "anyone" ACL right

for an example here is the lam command on an mailbox

-------------------------------------
localhost> lam user.test.Sent
test lrswipcda
anyone lrs
--------------------------------------

So how can I fix this problem so that user of particular mailboxes have
the permission on their mailbox ? 
please help