We recently enabled LDAP lookups (against Active Directory) for recipient verification. It's working great but I did get one "server error" message from the postfix daemon that had a session transcript that ended with:
Out: 451 <[EMAIL PROTECTED]>: Temporary lookup failure In: RSET Out: 250 Ok In: QUIT Out: 221 Bye What is the end result of this? Does the sender see an immediate error? Does the sending MTA queue and retry? I have googled in vain for the answer. The LDAP lookup is configured for multiple domain controllers, but from the timestamp on the error, I am guessing that the error was generated just as the domain controller being queried was going down or coming up from a reboot. I don't suppose there is much else I can do about that. We did verify that lookups work when the first listed LDAP server is fully down, but apparently the openldap libs didn't handle this transient situation gracefully. Anyway, this is beside the point of my question. All I really want to know is if the message is lost after a 451. -- Jeff
