We've moved to our new internet ISP service in our corporate office. We host an internal exchange 2010 server. The exchange server is in a dag setup; we have two servers in the farm. I use xo communications as my external DNS host. XO also hosts our external
web site. We don't have internal webservers and all web content resides within XO web services. The new isp service assigned us 4 useable public IPs. We have assigned a public static ip to our exchange farm and did a static NAT in our firewall. We use Postini
as our mail filter. Currently I have an external DNS entry for mail.company.com A record and it is pointing to the old ISPs public IP address. For now we are planning to keep XO as our web hosting and proceed using the new local ISP services for our local
Internet. Im curious, Do I keep the entry dns A record - XO's IP address or do I use the new public iP that I have assigned to my exchange server (mail.company.com)? If so how do I make sure that our external company website stays to the XO public IP and my
mail.company.com pointed to my new ISP public IP?
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