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6

The way names in resolv.conf works is that a hostname is attempted to be resolved by the FIRST name in the list, waits until a timeout, then proceeds to the next one and so on until you exhaust the list of nameservers. If what you are trying to do is to use multiple hostname resolution souces concurrently, this is not the way things are designed. As to ...


3

The standard dnslookup router of exim uses an algorithm to decide how to resolve an email address (this is detailed in the Exim manual on the chapter detailing dnslookup router). Looking at the results from dig, this seems fine: $ dig mail.eu mx ; <<>> DiG 9.8.4-rpz2+rl005.12-P1 <<>> mail.eu mx ;; global options: +cmd ;; Got ...


2

For IPv4 If your IP address is a.b.c.d, then you need to add the following DNS entry: d.c.b.a.IN-ADDR.ARPA IN PTR your-domain.name. This entry needs to be added to the authoritative name server that hosts the zone in which it is located. That server is usually run by your service provider. For IPv6 If your IP address is ...


2

Contact the administrator of your ip-range and ask them to set up the PTR or reverse DNS record for your ip-address to your desired server name. If you have a range assigned by your provider they may offer the option to delegate reverse DNS of your ip-range to your DNS servers Typically most VPS and server providers have a provision for that in their ...


1

Neither DNS resolver lists nor NS record sets are intrinsically ordered, so there is no "primary". Clients are free to query whichever one they want in whichever order they want. For resolvers specifically, clients might default to using the servers in the same order as they were given to the client, but, as you've discovered, they also might not.



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