Unable to locate maildrop for user

[sam]

Hi,

I have setup cyrus-imapd version 2.2. But when a mail client tried to 
connect to pop3, it failed with the following error:

pop3[41554]: Unable to locate maildrop for sam: Mailbox does not exist

I have tried cyradm, but it does only create Mailbox in the 
/var/spool/imap directory:

 > cm Mailbox
 > sam Mailbox sam lrswipcd
 > lam
usage: listaclmailbox mailbox
 > lm Mailbox
Mailbox (\HasNoChildren) 
 > lam Mailbox
sam lrswipcd
anyone lrs

Thanks
sam

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