We have Exchange Server 2010 on AD Sites. We don't have HLB. Our SMTP relays redirect incoming internet Traffic to our VIP NLB (CAS/HUB).
We're going to deploy Exchange Server 2016. Internal Outlook clients will find Exchange server without problem. We'll use DNS Round Robin
My doubt is if our SMTP Relays / firewall can query DNS to find Exchange Server. I don't sure if it can use DNS round robin.
In this situation...I'm thinking deploy 2 Edge Exchange servers. One server on Site1 and one server on Site2. I'll use NLB.
So, our SMTP Relays / firewall redirect traffic to this VIP