ME020206 - HOWTO: PTR records and how to obtain one


SUMMARY

What is a PTR record is and how to obtain one?

DETAIL

A Reverse DNS lookup is used by remote hosts to determine who 'owns' an IP address.
For this to occur the 'owner' of the IP address must have registered a PTR record for the IP address.       

Many mail servers will perform a reverse DNS lookup on the IP address that is attempting to connect to them. Therefore the mail server needs to have a PTR record associated with the IP address that it uses to communicate with other servers.

It is possible to determine who owns an address using http://www.dnsstuff.com
Example: http://www.dnsstuff.com/tools/ptr.ch?ip=69.0.203.15 or http://www.dnsstuff.com/tools/ptr.ch?ip=mail.mailenable.co.uk

The 'owner' of the IP address is the last host that responded to the DNS query. It is this host that needs to be reconfigured to either pass on the request for the PTR record or respond to the PTR request.

To create a PTR record requires access to the server that holds the DNS records.  More information on this can be found here: Article ME020115

Otherwise, the owner (usually your ISP) will need to create the PTR record on your behalf.

MORE INFORMATION

How to set up PTR records under Microsoft's DNS Server: Article ME020115

PTR record exists but the mail server is unable to receive mail from some domains: Article ME020180

Unable to send email to some domains, such as Hotmail, Yahoo, etc.: Article ME020003 



Product:MailEnable (All Versions)
Module:General
Keywords:DNS PTR reverse DNS hotmail yahoo pointer record
Class:HOWTO: Product Instructions
Revised:Wednesday, May 4, 2016
Author:
Publisher:MailEnable