?
Solved

Reverse DNS lookup failing

Posted on 2008-10-08
13
Medium Priority
?
463 Views
Last Modified: 2012-06-27
I am transitioning ffrom an Exchange 2000 server to an Exchange 2007 server. Mail sent from mailboxes on the existing 2000 server pass reverse DNS looklups but mail sent from the new 2007 server fails. We use TrendMicro IMHS for our spam filtering, so our MX record is pointed at Trend. Trend Says that they are not providing reverse lookup info and I need to request it from my ISP. My ISP is Network Solutions. when I look at my DNS entries on the Network Solutions website I do not see an option for reverse lookup. I have (A) records set up for the public addresses of both servers. Most mail domains are rejecting mail from my new server . I am testing with an sbcglobal.net account that accepts mail from my new server, but, it says right in the headre that it failed reverse lookup. Can anyone help?
0
Comment
Question by:HeinensIT
[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
  • 7
  • 5
13 Comments
 
LVL 7

Expert Comment

by:bcrosby007
ID: 22668468
You will have to create a PTR record. Your DNS host can do this unless you manage it. If you do you will have to set it up.
http://www.tech-faq.com/reverse-dns.shtml 
0
 
LVL 7

Expert Comment

by:bcrosby007
ID: 22668480
0
 

Author Comment

by:HeinensIT
ID: 22669351
I will add the PTR record and see what happens.
Thanks.
Why does one server work and not the other? Neither have PTR records with my ISP.
0
NFR key for Veeam Backup for Microsoft Office 365

Veeam is happy to provide a free NFR license (for 1 year, up to 10 users). This license allows for the non‑production use of Veeam Backup for Microsoft Office 365 in your home lab without any feature limitations.

 
LVL 7

Expert Comment

by:bcrosby007
ID: 22669378
The only email that will fail is when you are trying to send email to a domain that requires a reverse lookup for SMTP connection.
0
 

Author Comment

by:HeinensIT
ID: 22669745
Right, if I send a message to my AOL account from a mailbox on my 2000 server it gets delivered, if I send a message to the same AOL account from the new 2007 server, it is rejected. The difference is that they have different addresses. To the best of my knowledge, neither have PTR records.
0
 
LVL 7

Expert Comment

by:bcrosby007
ID: 22669803
Then they are doing different blacklisting. Maybe a HELO or EHLO blacklist. Go here and run the SMTP diagnostics.

www.mxtoolbox.com 
0
 

Author Comment

by:HeinensIT
ID: 22670166
Did I mention that this was all set up WAYYYYY before I joined this company. Nothing is set up as I would have done it. It turns out that, although network solutions manages our external DNS, the PTR records appear to come from FidelityAccess, wich is our actual ISP. I am working on this now.
Thanks for your help. I will post if the PTR record thing pans out.
0
 
LVL 7

Accepted Solution

by:
bcrosby007 earned 1000 total points
ID: 22671043
Cool. So your 2000 server had a PTR?
0
 

Author Comment

by:HeinensIT
ID: 22672260
Yes, once I discovered who our ISP actually is it was no problem. thanks a lot.
0
 

Author Comment

by:HeinensIT
ID: 22672277
Thnks
0
 
LVL 7

Expert Comment

by:bcrosby007
ID: 22672368
I answered the question correctly. This should not be closed, just a solution accepted.
0
 
LVL 7

Expert Comment

by:bcrosby007
ID: 22686154
I answered the question correctly. This should not be closed, just a solution accepted.
0

Featured Post

Prepare for your VMware VCP6-DCV exam.

Josh Coen and Jason Langer have prepared the latest edition of VCP study guide. Both authors have been working in the IT field for more than a decade, and both hold VMware certifications. This 163-page guide covers all 10 of the exam blueprint sections.

Question has a verified solution.

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

This article aims to explain the working of CircularLogArchiver. This tool was designed to solve the buildup of log file in cases where systems do not support circular logging or where circular logging is not enabled
After hours on line I found a solution which pointed to the inherited Active Directory permissions . You have to give/allow permissions to the "Exchange trusted subsystem" for the user in the Active Directory...
To show how to create a transport rule 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 >> Rules tab.:  To cr…
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…
Suggested Courses

770 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