We have an Exchange 2013 server that is in house and all is well. We want to host the website for our domain at GoDaddy. When I went to setup the website hosting, the DNS records were changed. No big deal, but the problem I have found is that when the A record for the domain (@ record) is pointed to the GoDaddy IP address for the website, Exchange can send mail but cannot receive mail. When I point the A record (@ record) back to our IP address in our office, Exchange works just fine. I'm a little stumped because the Exchange server was intentionally setup so it did not point to the domain alone. Instead it points to outlook.mydomain.com. Is there a way to find out why this A record is breaking Exchange?