On 12/7/2009 1:07 PM, Javier Henderson wrote:
Greetings,
I am trying to configure Postfix to gracefully deal with the failure of the
LDAP server it uses for alias resolution.
It's working fine, using the LDAP server to resolve u...@domain.com to
u...@somehost.domain.com, but if the LDAP server dies or becomes unreachable
for whatever reason, Postfix replies with 5xx error codes about the user being
invalid.
Postfix always replies with a 4xx code when a lookup table is
unavailable or returns an error.
If your postfix is responding with 550, it's because your LDAP
server is lying to postfix that a lookup key doesn't exist
rather than reporting an error. That's broken behavior by the
LDAP server, not postfix.
Is there a way to configure it to return 4xx codes so the remote end tries
later?
If you're unable to repair your LDAP server, you can
periodically dump the LDAP data to a local hash: or cdb: file.
-- Noel Jones
