Reverse DNS

John Oliver, Jr. [MVP]

2008-05-10 01:30:21 UTC

Edge server is not required here. This is a DNS issue. Your Static IP
should be assigned to your Router/Firewall and not your Exchange Server.
Your ISP must create your Reverse PTR Record for your Static IP. You can
verify your PTR Record at www.dnsstuff.com.
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John Oliver, Jr
MCSE, MCT, CCNA
Exchange MVP 2008
Microsoft Certified Partner

Post by James
Our site configuration
The server is a windows 2003 r2 and only has one network card
Single Exchange server 2007 with sp1 and rollup1. Server roles installed
are Mailbox, Client, Hub and Unified Messaging. The Exchange server’s IP
address is a non-routable.
Currently AOL and few other email server are not accepting emails from our
site. Here is the error message “Last Error: 421-: (DNS:NR)
http://postmaster.info.aol.com/errors/421dnsnr.html
421 SERVICE NOT AVAILABLE” . the problem is that our email server has an
internal IP address and we tried binding a external IP address to our network
adapter. We are a small company only about 100 employees on email and we
would like to avoid buying another exchange server license. So I have a
couple of question.
Is there away to fix our external DNS records without a static IP assigned
to our email server, so that a reverse DNS lookup will succeeds?
Or do we need to deploy an edge transport server in the DMZ and route mail
through that server?
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Thank You!