What would be the best way to loadbalance/failover our incoming email.
We have 2 sites, with 2 edge servers at each site, each of them has an external facing ip address.
We have a 3rd party spam/virus protection and this currently points to one of the ip addresses of the external smtp server. They have told us that we can change the IP to a hostname and our external DNS can then have records to point to both servers.
From Exchange 2010 I guess we cannot have 2 edge servers with the same name subscribed. So how would we go about doing this?
Would it be to add an alias or Cname at DNS level?
Any help and examples would be great.