Am 22.04.2014 15:53, schrieb Tim Smith: > A client of mine informed me that they did not receive some mail from someone > in particular. When I examined the > logs, I found the following warning: > > *warning: hostname delivery.mailspamprotection.com does not resolve to > address 198.143.161.12: Name or service not > known* > > I checked at MXToolbox and could see that delivery.mailspamprotection.com > does indeed resolve to that IP address > (along with a number of others!) and a PTR is in place also. > > Can someone help me find out why Postfix believes this is an error? What > mechanism does postfix use to resolve domains?
most likely because it has a ton of addresses [harry@rh:~]$ host 198.143.161.12 12.161.143.198.in-addr.arpa domain name pointer delivery.mailspamprotection.com. [harry@rh:~]$ host delivery.mailspamprotection.com ;; Truncated, retrying in TCP mode. delivery.mailspamprotection.com has address 184.154.58.229 delivery.mailspamprotection.com has address 184.154.208.34 delivery.mailspamprotection.com has address 108.178.24.174 delivery.mailspamprotection.com has address 108.163.220.54 delivery.mailspamprotection.com has address 198.143.161.30 delivery.mailspamprotection.com has address 198.143.161.28 delivery.mailspamprotection.com has address 184.154.48.170 delivery.mailspamprotection.com has address 69.175.69.92 delivery.mailspamprotection.com has address 198.143.161.12 delivery.mailspamprotection.com has address 108.163.204.149 delivery.mailspamprotection.com has address 96.127.176.251 delivery.mailspamprotection.com has address 108.163.201.228 delivery.mailspamprotection.com has address 198.143.161.19 delivery.mailspamprotection.com has address 69.175.69.91 delivery.mailspamprotection.com has address 96.127.190.5 delivery.mailspamprotection.com has address 96.127.176.253 delivery.mailspamprotection.com has address 198.143.161.26 delivery.mailspamprotection.com has address 108.163.228.172 delivery.mailspamprotection.com has address 184.154.208.35 delivery.mailspamprotection.com has address 108.163.228.171 delivery.mailspamprotection.com has address 184.154.48.174 delivery.mailspamprotection.com has address 96.127.190.3 delivery.mailspamprotection.com has address 184.154.58.227 delivery.mailspamprotection.com has address 69.175.69.90 delivery.mailspamprotection.com has address 184.154.48.173 delivery.mailspamprotection.com has address 184.154.208.38 delivery.mailspamprotection.com has address 184.154.58.226 delivery.mailspamprotection.com has address 108.178.24.179 delivery.mailspamprotection.com has address 198.143.161.14 delivery.mailspamprotection.com has address 108.163.228.174 delivery.mailspamprotection.com has address 108.163.201.229 delivery.mailspamprotection.com has address 108.163.243.188 delivery.mailspamprotection.com has address 108.163.243.187 delivery.mailspamprotection.com has address 108.163.228.173 delivery.mailspamprotection.com has address 108.178.24.182 delivery.mailspamprotection.com has address 108.163.220.51 delivery.mailspamprotection.com has address 96.127.176.252 delivery.mailspamprotection.com has address 184.154.48.171 delivery.mailspamprotection.com has address 69.175.69.93 delivery.mailspamprotection.com has address 184.154.208.36 delivery.mailspamprotection.com has address 108.163.243.190 delivery.mailspamprotection.com has address 184.154.58.228 delivery.mailspamprotection.com has address 108.163.220.53 delivery.mailspamprotection.com has address 108.163.204.146 delivery.mailspamprotection.com has address 69.175.69.94 delivery.mailspamprotection.com has address 96.127.190.2 delivery.mailspamprotection.com has address 108.178.24.172 delivery.mailspamprotection.com has address 184.154.177.50 delivery.mailspamprotection.com has address 108.163.204.147 delivery.mailspamprotection.com has address 108.163.220.52 delivery.mailspamprotection.com has address 96.127.176.250 delivery.mailspamprotection.com has address 108.178.24.180 delivery.mailspamprotection.com has address 96.127.176.254 delivery.mailspamprotection.com has address 198.143.161.20 delivery.mailspamprotection.com has address 184.154.58.230 delivery.mailspamprotection.com has address 198.143.161.22 delivery.mailspamprotection.com has address 198.143.161.13 delivery.mailspamprotection.com has address 108.163.204.148 delivery.mailspamprotection.com has address 198.143.161.27 delivery.mailspamprotection.com has address 108.163.220.50 delivery.mailspamprotection.com has address 108.163.243.189 delivery.mailspamprotection.com has address 184.154.48.172 delivery.mailspamprotection.com has address 96.127.190.6 delivery.mailspamprotection.com has address 108.163.201.230 delivery.mailspamprotection.com has address 108.178.24.178 delivery.mailspamprotection.com has address 198.143.161.29 delivery.mailspamprotection.com has address 108.163.204.150 delivery.mailspamprotection.com has address 108.178.24.181 delivery.mailspamprotection.com has address 198.143.161.21 delivery.mailspamprotection.com has address 184.154.208.37 delivery.mailspamprotection.com has address 108.163.201.226 delivery.mailspamprotection.com has address 198.143.161.18 delivery.mailspamprotection.com has address 108.178.24.173 delivery.mailspamprotection.com has address 108.163.201.227 delivery.mailspamprotection.com has address 198.143.161.11 delivery.mailspamprotection.com has address 108.163.228.170 delivery.mailspamprotection.com has address 108.178.24.170 delivery.mailspamprotection.com has address 108.178.24.171 delivery.mailspamprotection.com has address 198.143.161.10 delivery.mailspamprotection.com has address 108.163.243.186 delivery.mailspamprotection.com has address 96.127.190.4
