JF Mezei put forth on 5/21/2010 4:20 AM: > connect from cpe-67-252-139-22.buffalo.res.rr.com [67.252.139.22] > May 19 01:09:15 velo postfix/smtpdP26473]: warning: > 22.139.252.67.zen.spamhaus.org: RBL lookup error: Host or domain name > not found. Name service error for name=22.139.252.67.zen.spamhaus.org > type=A: Host not found, try again
That error is telling you Postfix it can't locate zen.spamhaus.org. You're misreading the error. If I'm not mistaken, this is the same error I received when I switched my Postfix MX to use Google Public resolvers (without checking the Spamhaus TOS first) quite a while ago. I discovered, with help from this list, that Spamhaus blocks Google's public resolvers, as well as many other "public" type resolvers, such as many ISPs--basically any single IP address that surpasses the query volume threshold for free use. The best long term solution is to install something like PowerDNS recursor which is a very lightweight caching resolver. I installed it many months ago. It solved this problem permanently, and my Postfix performance increased a bit to boot due to lower latency on client rDNS and dnsbl lookups. -- Stan
