Solved

Exchange DNS Problems

Posted on 2011-09-21
4
1,208 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

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Lotus Notes – formerly IBM Notes – is an email client application, while IBM Domino (earlier Lotus Domino) is an email server. The client possesses a set of features that are even more advanced as compared to that of Outlook. Likewise, IBM Domino is…
Local Continuous Replication is a cost effective and quick way of backing up Exchange server data. The following article describes the steps required to configure Local Continuous Replication. Also, the article tells you how to restore from a backup…
In this video we show how to create a Distribution Group 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 Recipients >>…
In this video we show how to create an Address List 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 Organization >> Ad…

867 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

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now