Hi!
We have just been experiencing a power outage in the result of which our
mail server with postfix did come back up fine but our LDAP server did
not come back up. As a result emails to valid users (administrated via
LDAP) was rejected with a permanent "User unknown" error.
I was suprised that an LDAP connection failure did not result in a
temporary error condition, in fact the mail service was not operational
an I would have expected an "temporary configuration error" status. I
did not find any setting that would influence this behavior. Is there
any method to prevent mails from being rejected on LDAP failure?
Note 1: even a powerful UPS will only help in a coordinated shutdown if
the power outage is long enough.
Note 2: the misconfiguration that prevented the LDAP server to start up
has been resolved by now.
Best regards,
Lutz
