Fedora directory users - Oct 2007 - problems with post/fedora-ds

Hi,

I''m having some problems with fedora-ds and postfix in a high-rate
environment.  First, let me say that we are migrating from openldap-1.2.2 to
Fedora-DS.   The configuration with postfix+openldap has to be migrated to
fedora-ds and the postfix+openldap works great in the high-rate
environment.   I have a relay_recipient_maps and a alias list which both use
ldap.      However, ldaps connections (and ldap) connections to fedora-DS
seem to time out in a high-rate environment.  In slow-rate environment were
there are a few 10s of emails an hour, things work fine.   In the high-rate
where you receive 1-5 of emails per second, I am seeing lots of temporary
lookup failures.  My configuration looks exactly like the POSTFIX Wiki
configuration on the directory.fedoraproject.org/wiki page.

We did some debugging to  take a look at postfix, which attempts to open a
connection to the ldap server and does, then it wants to perform multiple
lookups per connection but this doesn''t work--it seems for some reason
that
postfix is unable to do more than one lookup per connection.    The
fedora-DS ends up with many connections from postfix which eventually
time-out.

Any ideas as to what could be wrong?

Thanks,
Jeff