Keld Jørn Simonsen wrote:
Is it true that if a PTR was found, then this name would be displayed in the above log message, and not the IP number?
No, the name will still be "unknown" if the hostname->IP lookup fails.
Anyway, can you confirm that there is no check on availablilty of the domain name that is referenced in the PTR RR? I would actually think that such a check was a wise thing to do. But then you can catch some valid domains that has a bad configuration.
The reject_unknown_reverse_client_hostname and reject_unknown_client_hostname work exactly as documented.
Anyway if it is a name server timeout, then I think this is always handled by a 450 response. In my case the mail was rejected.
Yes, temporary errors always get a 450 response. -- Noel Jones
