trouble with post to shared folder

[Francesco Trimarchi]

Hello to everybody!

I set-up a kolab 2.0.4 server and I have this problem:

When I try to post to a shared folder
(kolab+shared.mailspam at domain.tld): 
I received this message:

'kolab+shared.mailspam at domain.tld 10/09/2006 21.41
550 <kolab+shared.mailspam at domain.tld>: Recipient address rejected: User
unknown in local recipient table

If I display the mailbox list acl (cyradm) I see the listing above

shared.mailspam at domain.tld
anyone lrswipda

Someone can help me to troubleshoot this problem?

Thanks in advance

Francesco