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After installing Exchange Server, the next step is to configure external DNS for Exchange. It’s important to keep the same namespace internal and external. We will sign in to the public DNS and create the records for Exchange Server. In this article, you will learn how to configure external DNS for Exchange Server.
Table of contents
Information Public DNS Exchange
Important: Read the article Exchange namespace design and planning before going further.
There are three records types that we will add to the public DNS. About the values, you should only enter an IP address for the A record. The MX record is the spam filter, and the CNAME (alias) should point to the DNS name of the A record for the Exchange server. If your IP address changed due to changing Internet Service Providers, you would only need to update the A record.
|Record Type||TTL||DNS Name||Priority||Value|
An architecture view of the Exchange namespace is shown below in the topology.
Create Public DNS records
Sign in to your external DNS registrar. Configure the records.
Check the Public DNS records
Let’s run the Resolve-DnsName cmdlet to verify the:
- MX record
- A record
- Autodiscover record
Run PowerShell as administrator. Run the Resolve-DnsName cmdlet and the -Server parameter. The -Server parameter will resolve the name against the Google DNS servers. We can check the Public DNS records on the LAN or any external network.
Note: Don’t immediately resolve the external DNS records, as that will not work. The servers around the world have not reflected the changes. Give it a maximum of an hour as the DNS propagation will need time.
Check MX record
Verify the MX record.
PS C:\> Resolve-DnsName -Type MX exoip.com -Server 220.127.116.11 | Format-Table -AutoSize Name Type TTL Section NameExchange Preference ---- ---- --- ------- ------------ ---------- exoip.com MX 300 Answer mx1.spambull.com 10 exoip.com MX 300 Answer mx2.spambull.com 20 exoip.com MX 300 Answer mx3.spambull.com 30 exoip.com MX 300 Answer mx4.spambull.com 40
Check A record
Let’s have a look at the public A record.
PS C:\> Resolve-DnsName -Type A mail.exoip.com -Server 18.104.22.168 | Format-Table -AutoSize Name Type TTL Section IPAddress ---- ---- --- ------- --------- mail.exoip.com A 300 Answer 22.214.171.124
Check autodiscover record
As of last, let’s check the public autodiscover record.
PS C:\> Resolve-DnsName -Type TXT autodiscover.exoip.com -Server 126.96.36.199 | Format-Table -AutoSize Name Type TTL Section NameHost ---- ---- --- ------- -------- autodiscover.exoip.com CNAME 300 Answer mail.exoip.com
You learned how to configure External DNS for Exchange Server. Add the three records to your public DNS and verify that you can resolve the external DNS records. Don’t forget that it can take a little time before you can resolve the DNS.
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