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Strictly speaking, there is no requirement for nameservers to have PTR records. It's still a very good idea in order to make sure that these devices are well identified, but no functionality breaks if those records are missing. That said, if you're having to ask this question, I think the more imminent issue is whether or not you should be running ...


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Name server:example.com: host not found Is not necessarily a sendmail specific problem but most likely a generic DNS issue. The hostname (or MX record) for example.com can't be resolved. Check if dig any example.com also gives an error => DNS problem that needs to be resolved as even when configured with a Smart Host by default sendmail still does a ...


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My bind-9.8.2-0.37 from CentOS 6 says after a slave is restarted (for each of the zones, even if they are already cached): 08-Apr-2016 12:15:07.571 zone example.com/IN: loaded serial 2016040103 The named.conf contains, among other stuff:: logging { channel general_file { file "/var/log/named/general.log" versions 3 size 5m; severity dynamic; ...


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To find the name server for abc.com a DNS server will query the DNS server for com. This will return the nameserver information provided to your registrar. You must provide the IP addresses to the registrar when the servers are within your domain. To find the com DNS servers the DNS server will contact one of the root domain servers. When the DNS ...



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