Solved

Exchange 2010 reverse DNS not working

Posted on 2013-11-12
4
438 Views
Last Modified: 2013-11-19
We currently have two networks running on two separate IP address spaces. We had to move our exchange server from one to the other. Now we are getting failed reverse DNS lookup NDRs.

Our MX records are showing the correct IP address, when I ping the mail server from outside the network the correct IP address shows up. However, when I use mxtoolbox.com's smtp tester I get the error that SMTP reverse banner check is failing and we are getting numerous NDRs due to lack of reverse DNS.

What am I missing?

Please let me know what information I need to provide to help you solve this issue.
0
Comment
Question by:Byrdpire
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 4

Accepted Solution

by:
Naushad shaikh earned 250 total points
ID: 39641726
have you created PTR record on your external DNS contact your ISP and make sure reverse DNS setup correctly
0
 
LVL 76

Assisted Solution

by:Alan Hardisty
Alan Hardisty earned 250 total points
ID: 39641731
MX Toolbox gives a false report for Exchange 2007 / 2010 / 2013, so ignore that.

Reverse DNS is something setup on your IP Address.

From a command prompt you can see what is set on the IP Address:

nslookup <IP_Address> (e.g., nslookup 123.123.123.123)

That should tell you what is set as reverse DNS.

If nothing is set, call your ISP and ask them to add it, but make sure you have an A record pointing to the same IP Address or they won't add it e.g., mail.yourdomain.com

Alan
0
 
LVL 63

Expert Comment

by:Simon Butler (Sembee)
ID: 39644555
If you are using the same firewall, it could be the NAT is wrong, so you are going out on the wrong IP address.

Simon.
0
 
LVL 1

Author Closing Comment

by:Byrdpire
ID: 39659694
Thanks guys, I've never had to do this before, didn't realize my old boss had setup originally and we've just been using it.

I gave AT&T a call and they were happy to help add a reverse PTR for our IP address, contrary to what I had read on the internet.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this article, I am going to show you how to simulate a multi-site Lab environment on a single Hyper-V host. I use this method successfully in my own lab to simulate three fully routed global AD Sites on a Windows 10 Hyper-V host.
A list of top three free exchange EDB viewers that helps the user to extract a mailbox from an unmounted .edb file and get a clear preview of all emails & other items with just a single click on mailboxes.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

749 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question