Delivering to a folder

[Lee]

We're using postfix -> lmtp -> cyrus 2.1.16 on a redhat 9 box.

When I try to send a message to user+folder at boxname.com its always 
delivered to the user's inbox. What do i need to do to get the messages 
delivered to the folder?

Our imapd.conf is attached below.

Thanks,
Lee


IMAPD.CONF:

# Cyrus Imapd Configuration

configdirectory: /export/cyrus/imap
partition-default: /export/cyrus/spool/imap
admins: admin

tls_cert_file: /export/cyrus/server.pem
tls_key_file: /export/cyrus/server.pem

allowanonymouslogin: no
allowplaintext: yes
sasl_mech_list: PLAIN
servername: localhost
autocreatequota: 0
reject8bit: no
quotawarn: 90
timeout: 30
poptimeout: 10
dracinterval: 0
drachost: localhost
sasl_pwcheck_method: saslauthd
sievedir: /export/cyrus/sieve
sendmail: /usr/sbin/sendmail
#sieve_maxscriptsize: 32
#sieve_maxscripts: 5

# Get rid of folders as subfolders of INBOX
altnamespace: yes
unixhierarchysep: yes