Issue with using LDAP for transport maps

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Issue with using LDAP for transport maps
\ Shawn Sivy (14 Apr 2007)
. \ (Wietse Venema) (14 Apr 2007)
. . \ Patrick T. Tsang (15 Apr 2007)
. . . \ Victor Duchovni (15 Apr 2007)
. . . \ (Wietse Venema) (15 Apr 2007)
. . \ Patrick T. Tsang (15 Apr 2007)
. . . \ (Wietse Venema) (15 Apr 2007)
. . . . \ Patrick T. Tsang (15 Apr 2007)
. . . . . \ (Wietse Venema) (15 Apr 2007)

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3 msg	ldap search fails

Subject:	Issue with using LDAP for transport maps
Group:	Postfix-users
From:	Shawn Sivy
Date:	14 Apr 2007

I'm trying to configure a transport map using LDAP on a central gateway
server so that I can direct users to their appropriate back-end servers
for final delivery.

It appears to be working, but if I update the mailHost attribute in the
user's LDAP entry, it does not take effect until I do a "postfix
reload". Shouldn't the change be dynamic and not require a reload? I
used tcpdump to watch traffic going to our LDAP server (Sun IPlanet).
It takes a minute or so, but I then see a request to to the LDAP server,
and it returns the correct mailHost value. However, the new mailHost
value is not being used for the transport. It continues to use the old
value for the transport. If I do a postfix reload, it starts using the
new value from LDAP.

Is there some sort of caching going on? If so, can I disable it or turn
down the TTL? How else can I debug this? The postmap -q command returns
the correct entry each time.

I'm using the Postfix that comes bundles with Red Hat Enterprise Linux
4. I believe it is Postfix version 2.2.10.

-Shawn