Hi EveryoneI'm trying to find some documentation re excahnge DNS settings.To clarify my situation, my company Exchange server is server1.company.LAN it is on an internal IP range.This server has a fully qualified domain name on the SMTP connector as server1.company.COM.When you run an nslookup on the MX record for company.com it returns the proper external IP address and also the full DNS name server1.company.comWe also deal with mail for remote sites through this server, they generally use company.de. If you do an MX lookup on this address it returns mx0.company.de but points to my external IP address. I can confirm that i can send and receive mail for users in Germany ok through this server.My ISP confirms that we have proper reverse DNS records in place.Internally I have an MX record that points to server1.company.COMI have just added the details company.com to the TCP/IP DNS settings on this server.My concern is the overall configuration of the DNS for exchange, how to configure it for multiple domains, should the company AD domain be changed from company.LAN to company.COM to match these external MX records.

No. Not at all. what you have done on the DNS is the SMTP domain of the company, which is reqd for mail flow. The AD domain is not required to be changed according to the SMTP domain.I always prefer to keepAD on domain.local and SMTP domain on domain.comRaj