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Reverse DNS lookup failing

Posted on 2008-10-08
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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?
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Question by:HeinensIT
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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 
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by:bcrosby007
ID: 22668480
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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.
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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.
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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.
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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 
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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.
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bcrosby007 earned 250 total points
ID: 22671043
Cool. So your 2000 server had a PTR?
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by:HeinensIT
ID: 22672260
Yes, once I discovered who our ISP actually is it was no problem. thanks a lot.
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by:HeinensIT
ID: 22672277
Thnks
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by:bcrosby007
ID: 22672368
I answered the question correctly. This should not be closed, just a solution accepted.
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by:bcrosby007
ID: 22686154
I answered the question correctly. This should not be closed, just a solution accepted.
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