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Reverse DNS (rDNS) maps an IP address back to a hostname. Many mail servers reject email from IPs without a valid rDNS record, so this is worth setting up if you run a mail server on your VPS.

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Prerequisites

Create a forward DNS record (A or AAAA) pointing your hostname to the server’s IP address before setting rDNS. The record won’t work without a matching forward entry.

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Set up rDNS

1

Open your VPS in the client area

Log in to my.speedypage.com and click Manage on the server you want to configure.
2

Find your IP address

Go to the Network tab and find the IP address you want to set rDNS for.
3

Set the hostname

Click Reverse DNS, enter the hostname you want the IP to resolve to, and click Update.

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Verify the record

After a few minutes, confirm the rDNS record is working by running this command in a terminal: 
dig -x YOUR_IP_ADDRESS +short
This should return the hostname you entered.