Solved

Exchange DNS Problems

Posted on 2011-09-21
4
1,231 Views
Last Modified: 2012-06-21
I have an Exchange 2007 server trying to send mail to one particular domain and it keeps getting rejected saying there is an invalid PTR record..  here is the exact error message..

"mail.premier-technologies.net #501 Connecting IP must have valid PTR record for xx.xx.xx.xx ##"

Now, i have checked on MXToolbox for various checks..
*My MX record points to .. mail.domain. com as my proper public IP address
*I do a reverse lookup on that public IP address and i produce a PTR record that shows my public IP address in reverse order
I have an A record that points to my webmail.domain.com

Do I also need to have an A record created that points  mail.domain.com to my public IP?

I'm at a loss as to why this one domain is rejecting emails from my domain with invalid PRT record error message
0
Comment
Question by:ddsvi
  • 2
  • 2
4 Comments
 
LVL 23

Expert Comment

by:jakethecatuk
ID: 36573964
go to www.mxtoolbox.com and run the diagnostics option.

If your mx record is mail.domain.com which points to 1.2.3.4, then the PTR record 1.2.3.4 needs to point to mail.domain.com :)

0
 
LVL 4

Author Comment

by:ddsvi
ID: 36574027
The diagnostics shows Reverse DNS as Failed...  here are the resutls when I do a reverse lookup on my public IP address that is found from the MX lookup.

ptr:1x.5x.8x.2x <correct public IP>

Auth - N

Type - CNAME

Domain Name - 2x.8x.5x.1x.in-addr.arpa  <correct public IP>

Canonical Name - 26.24/2x.8x.5x.1x.in-addr.arpa <correct public IP>

TTL - 23 hrs

So please forgive me here.. but is this PTR record wrong?  Where should mail.domain.com be in the pointer record per your suggestion?
0
 
LVL 23

Accepted Solution

by:
jakethecatuk earned 250 total points
ID: 36574089
the PTR record is wrong.

you need to get your ISP to update it for you.

on MXToolbox, if you run the same test for Experts Exchange (http://mxtoolbox.com/SuperTool.aspx?action=mx%3aexperts-exchange.com), you will see that the IP address resolves back to mail.experts-exchange.com

Similarly, simple NSLOOKUP produces a similar result: -

C:\Users\andrew>nslookup
> server 8.8.8.8
Default Server:  google-public-dns-a.google.com
Address:  8.8.8.8

> mail.experts-exchange.com
Server:  google-public-dns-a.google.com
Address:  8.8.8.8

Non-authoritative answer:
Name:    mail.dw.redsrci.com
Address:  72.29.183.251
Aliases:  mail.experts-exchange.com

> 72.29.183.251
Server:  google-public-dns-a.google.com
Address:  8.8.8.8

Name:    mail.experts-exchange.com
Address:  72.29.183.251
Aliases:  251.183.29.72.in-addr.arpa

>

Does that make sense now?

0
 
LVL 4

Author Comment

by:ddsvi
ID: 36574134
That helps .. thank you very much!
0

Featured Post

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

Question has a verified solution.

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

We are happy to announce a brand new addition to our line of acclaimed email signature management products – CodeTwo Email Signatures for Office 365.
Learn to move / copy / export exchange contacts to iPhone without using any software. Also see the issues in configuration of exchange with iPhone to migrate contacts.
In this video we show how to create an Accepted Domain in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Mail Flow >> Ac…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…

808 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