Reverse DNS or PTR records, How they work and what they do.

Normally when we do a DNS lookup, we check a domain for an associated IP. Reverse DNS is used to check an IP for an associated domain name. For this to work, you need a PTR record in the  IP address zone file. These records do not go in your domains zone file. PTR records are generally maintained by the owner of the IP, most likely your hosting provider or whoever you may be leasing your IP address from. On a server, the mail server relies heavily on RDNS to verify the sender of a message. If the sending hostname does not match the PTR record, then your message may… Read More

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Setting up Custom Nameservers in Cpanel

Using the nameservers on your server can make things a bit easier when it comes to editing your DNS settings. When using the name servers built into cPanel, you can add sub-domains without having to make any changes to the zone file. You can also setup SPF and domain keys with a couple clicks. This setup is ideal for small servers only hosting a few sites. If you are hosting a large number of sites it may be in your best interest to set up a separate nameserver server to ensure the single nameserver won’t be overloaded, thus taking your sites down. They do offer DNS clustering that works great… Read More

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