The Host record for the local computer can't be found in the DNS database [HostRecordMissing]
Exchange Setup can't continue because the Host (A) record for this computer can't be found in the DNS zone for the domain. Setup requires a valid A record for the server, and Exchange uses email server A records to find the IP address of the next hop to send messages.
To resolve this issue:
Verify that the local TCP/IP configuration points to the correct DNS server. For more information, see Configure TCP/IP settings.
Use Nslookup.exe to verify that the Host (A) record exists on the DNS server. For more information, see To verify A resource records exist in DNS.
For information about DNS name resolution, troubleshooting, and A records, see the following:
Having problems? Ask for help in the Exchange forums. Visit the forums at: Exchange Server.