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 serverâs 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 âLast Error: 421-: (DNS:NR) http://postmaster.info.aol.com/errors/421dnsnr.html 421 SERVICE NOT AVAILABLEâ . 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? -- Thank You!
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. -- John Oliver, Jr MCSE, MCT, CCNA Exchange MVP 2008 Microsoft Certified Partner "James" wrote in message news:9D1421E8-357F-447C-8555-DBBBB67B76B8@microsoft.com... > 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 serverâs 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 âLast Error: 421-: (DNS:NR) > http://postmaster.info.aol.com/errors/421dnsnr.html > 421 SERVICE NOT AVAILABLEâ . 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? > > -- > Thank You!
