failover smtp routing: what is best and easiest design

Servers: 2x Exchange 2013 (DAG)
OS: Windows 2012 R2

sites: 2 (main and Datacenter)

We're looking for the easiest way to keep receiving and sending out emails in the event that the firstserver or site goes down.  

Thanks
quadrumaneAsked:
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
Just have both sites in the MX records with the same cost value. Ensure that both sites are protected by the same measures. That way email will come in to both locations and Exchange will deliver it. There are no other options - MX records (DNS in general) has no service availability criteria, and cost doesn't mean anything with MX records these days.

If you insist on having email delivered to only one site then you are looking at manual work (opening port 25 on the second location) or using a third party service which can weight the delivery for you. Most hosted spam filtering services can do that for you.

Simon.
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