need help on delivering messages from postfix

[David Lang]

This isn't directly a cyrus problem, (but my google-foo is failing to find an 
answer).  I am failing to figure out how to have postfix check cyrus to see if a 
mailbox exists (it's rejecting messages because there isn't an entry in the 
virtual mapping file)

It's successfully delivering for addresses that are mapped in the file.

Using the lmtp connector, I understand that it should be checking lmtp, but it's 
not working.

the postfix config is: (with cruft from failed attempts)

compatibility_level = 2
soft_bounce = no
myhostname = mail.lang.hm
mydestination = $myhostname
unknown_local_recipient_reject_code = 550
mynetworks = 10.0.0.0/8
in_flow_delay = 0
recipient_delimiter = +
debug_peer_level = 2
debugger_command =
          PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
          ddd $daemon_directory/$process_name $process_id & sleep 5
inet_protocols = ipv4
propagate_unmatched_extensions = canonical, virtual, alias, forward, include
virtual_mailbox_domains = lang.hm, fajardo.hm, rdf.hm, elnicky.hm
virtual_mailbox_maps = cdb:/etc/postfix/vmailbox
virtual_alias_maps = cdb:/etc/postfix/virtual
virtual_destination_concurrency_limit = 30
virtual_destination_recipient_limit = 30
virtual_transport = lmtp:inet:10.0.0.100:26
mailbox_transport = lmtp:inet:10.0.0.100:26
local_transport = lmtp:inet:10.0.0.100:26
fallback_transport = lmtp:inet:10.0.0.100:26
local_recipient_maps = lmtp:inet:10.0.0.100:26
alias_maps = hash:/etc/aliases
sendmail_path = /usr/sbin/sendmail.postfix
newaliases_path = /usr/bin/newaliases.postfix
mailq_path = /usr/bin/mailq.postfix
html_directory = no
manpage_directory = no
sample_directory = /etc/postfix
readme_directory = no
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
data_directory = /usr/var/lib/postfix
queue_directory = /usr/var/spool/postfix
config_directory = /etc/postfix
mail_spool_directory = /usr/var/mail
mail_owner = postfix
setgid_group = postdrop
mydomain = lang.hm
mynetworks_style = subnet
shlib_directory = /usr/lib/postfix
meta_directory = /etc/postfix
smtputf8_enable = no
biff = no
allow_all_users=yes