Postfix Cyrus lmtp delivery problems

Hi people.  Anyone have some mail server experience on Debian?

Postfix is throwing errors like this in the mail logs:

Aug 10 16:04:08 intranet postfix/lmtp[15132]: 469B31110134:
to=<[email protected]>, orig_to=<archive>, relay=none,
delay=92893, status=deferred (connect to
/var/run/cyrus/socket/lmtp[/var/run/cyrus/socket/lmtp]: No such file or
directory)

Yet if I set Postfix's shell to sh and su postfix , and then "touch"
that file it can be done without problems.

The permissions are set like this:

root@intranet:/etc/apt# ls -ld /var/run/
drwxr-xr-x 11 root root 420 2006-08-10 14:08 /var/run/

root@intranet:/etc/apt# ls -ld /var/run/cyrus/
drwxrwx--- 3 postfix mail 60 2006-08-08 15:53 /var/run/cyrus/

root@intranet:/etc/apt# ls -ld /var/run/cyrus/socket/
drwxrwx--- 2 postfix mail 100 2006-08-10 14:08 /var/run/cyrus/socket/

root@intranet:/etc/apt# ls -ld /var/run/cyrus/socket/lmtp
srwxrwxrwx 1 root root 0 2006-08-10 14:08 /var/run/cyrus/socket/lmtp

root@intranet:/etc/apt# groups cyrus postfix
cyrus : mail sasl
postfix : mail postfix


I used dpkg-statoverride to change the permissions on the socket
directory. 

Postfix's main.cf has this lmtp option:
mailbox_transport = lmtp:unix:/var/run/cyrus/socket/lmtp

The other options that are needed for cyrus are set properly in the conf
files.  

Any ideas as to how to fix this???

        Regards Geoff