>> Hello, >> I have a question regarding DNSBL usage with the main.cf >> smtpd_client_restrictions parameter. >> I have a server configured to check SpamHaus: >> main.cf >> . . . >> smtpd_client_restrictions = reject_rbl_client >> zen.spamhaus.org=127.0.0.[2..11], >> . . . >> This has been working very well, although I noticed the following error in >> my syslog: >> Sep 7 16:13:08 server postfix/smtpd[28363]: warning: >> 188.50.102.94.zen.spamhaus.org: RBL lookup error: Host or domain name not >> found. Name service error for name=188.50.102.94.zen.spamhaus.org type=A: >> Host not found, try again >> I am wondering - in normal checks against SpamHaus, if a host is not listed >> and the result is NXDOMAIN, I am assuming that Postfix interprets that the >> host is “ok” and does not log any information. In this case, though, it has >> logged the information and I am wondering if this is because Postfix was >> unable to contact SpamHaus at all, not just regarding the record: >> 188.50.102.94.zen.spamhaus.org ? >> Thanks, >> - J > > > Lookup error: means something didn't work; your DNS told postfix it couldn't > find spamhaus at all, but it was a temporary error so try again. Postfix > will ignore the result. > > If you get this rarely, it's nothing to worry about. If it happens often, > there may be a problem with your DNS server or network connection. > > -- Noel Jones
Hi Noel, Thanks for your reply. Ok, that’s what I was thinking - that it was a temporary DNS error for contacting SpamHaus, not SpamHaus saying that address was not listed. Just wanted to double-check. - J
