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We currently use BT's smtp server to send out our email via a smarthost and the rDNS comes back to hostxx-xx-xx-xx.in-addr.bt<wbr />openworld.<wbr />com not our actual IP. <br />
<br />
The reason for this that that we cannot send emails to virgin or blueyonder email addresses<br />
<br />
Please see here as we have the same issue<br />
<a href="http://community.virginmedia.com/t5/Email-Cloud-and-Webspace/En-explained-email-bounce-back-why-is-it-suddenly-happening-and/td-p/2875244" rel="ugc">http://community.virginmedia.com/t5/Email-Cloud-and-Webspace/En-explained-email-bounce-back-why-is-it-suddenly-happening-and/td-p/2875244</a>
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We currently use BT's smtp server to send out our email via a smarthost and the rDNS comes back to hostxx-xx-xx-xx.in-addr.btopenworld.com not our actual IP.

The reason for this that that we cannot send emails to virgin or blueyonder email addresses

Please see here as we have the same issue
http://community.virginmedia.com/t5/Email-Cloud-and-Webspace/En-explained-email-bounce-back-why-is-it-suddenly-happening-and/td-p/2875244 [http://community.virginmedia.com/t5/Email-Cloud-and-Webspace/En-explained-email-bounce-back-why-is-it-suddenly-happening-and/td-p/2875244]

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Yep, that is likely due to the reverse dns not matching up. If you contact BT with your account details, the external IP address of your internet line and the reverse dns hostname you want to use they will get that sorted for you (usually within 48 hours).
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Yep, that is likely due to the reverse dns not matching up. If you contact BT with your account details, the external IP address of your internet line and the reverse dns hostname you want to use they will get that sorted for you (usually within 48 hours).

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As everyone has stated for Reverse DNS you need to contact your ISP specifically. If you have multiple IP's in your block, then you will also need to configure the correct external IP address on your firewall as well. <br />
<br />
Will.
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As everyone has stated for Reverse DNS you need to contact your ISP specifically. If you have multiple IP's in your block, then you will also need to configure the correct external IP address on your firewall as well.

Will.

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Hi,<br />
If I lookup mail.mydomain.com it point to our correct static IP address but if I do a rDNS lookup on the IP it point to my broadband service providers server not mail.mydomain.com. How do I fix this as I think it is causing our sent email delivery problems?<br />
<br />
Thanks
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Hi,
If I lookup mail.mydomain.com it point to our correct static IP address but if I do a rDNS lookup on the IP it point to my broadband service providers server not mail.mydomain.com. How do I fix this as I think it is causing our sent email delivery problems?

Thanks

Reverse DNS

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.