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What is Reverse DNS?  How do I verify my Reverse DNS Settings?

In layman's terms, you can think of a Reverse DNS (RDNS) entry in your name server as an IP address that points back to a domain name.  When you browse a web site using a domain name, your browser performs a Forward DNS lookup to resolve the domain name to an IP address.  Reverse DNS is the exact opposite where you take the IP Address and see what domain is specified for that IP address.

Many Internet service providers and email providers, such as AOL and Hotmail, attempt to block spam by using reverse DNS lookups on incoming email.  They do this because spammers often try to hide their identity whereas reverse DNS is a way of providing your identity to help indicate you are not a spammer.

How can I determine what IP Address and Domain Name is displayed in my email headers?

The easiest way to determine what IP address and Domain Name your eNewsletter Pro email marketing software is using is to send yourself an email from eNewsletter Pro then view the headers.  If you are using Outlook you can view the headers by right clicking the message and choosing Message Options.  The following screen appears:

Setting Up Reverse DNS for newsletter software and email marketing

In this example, the FQDN is Junto.adcomplete.org and the IP address is  In this example, for the Reverse DNS to be correct, the IP Address of must resolve back to Junto.adcomplete.org

How can I determine what domain name my IP address resolves back to?

To determine if your IP Address resolves back correctly to the domain name, there are many tools on the internet that you can use.  One example is:

AOL Reverse DNS Tool

To use the Tool, enter your IP Address found in the email headers:

Using the AOL Reverse DNS Tool

If RDNS is setup properly, AOL will display a success message.  However, this only indicates that they found a reverse DNS record.  You must then verify that this matches the FQDN found in your email headers.


How can I change the Fully Qualified Domain Name that eNewsletter Pro utilizes in the email headers?

By default, SMTP Express uses the base IP address of the server, and the Fully Qualified Domain Name of the computer.  If the computer does not have a valid FQDN, or you wish to use a different one, you can modify the server registry settings to change the FQDN that appears in the email headers.  To do so, follow the instructions at the link below.

How do I change the Fully Qualified Domain Name (FQDN) used by Quicksoft SMTP Express?

If you wish to modify the server's FQDN, please see this article.



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