: Should I use Reverse DNS (rDNS) with or without "www."? If I set up a rDNS entry for my server, should I enter just the hostname or should I include www.? I assume that the A-Record for

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If I set up a rDNS entry for my server, should I enter just the hostname or should I include ?
I assume that the A-Record for example.com and example.com point to the same server, of course. The site is running on example.com, if that matters.

I am asking because I have been told different stuff by different support members of my hosting provider. I am sorry that I can not give you a link to a resource with any of these opinions, as I am not even sure what to search for.

An answer from personal experience would be great, but I would prefer if someone here knows of an "official" document that states this.

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@Shelley277

The domain name returned from the reverse DNS lookup of the IP address should itself have an A record in its DNS record that points back to the IP address (in order to be "forward-confirmed").

So, in the case of a www subdomain, which is usually just a CNAME record pointing to the main domain, you should probably specify the bare domain. eg. example.com.

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: Should I use Reverse DNS (rDNS) with or without "www."? If I set up a rDNS entry for my server, should I enter just the hostname or should I include www.? I assume that the A-Record for

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