I need to configure internet mail as backup to our in-house exchanger server 2013. The same both belong to the same domain as i am moving our name service to our in-house DNS server.
The internet server should actually kick in anytime the in-house server fails. A couple of ideas;
1. The internet server may be configured as a smarthost.
2. Mail may be pulled into a single box on the in-house exchange server and then distributed to the various user folders by the in-house exchange server
3. The internet server (or the in-house exchange server) may be configured as a relay to the in-house server (or internet server)
Please is any of these approaches viable? if any is, then pointers as to the approach to configuring any of these will be greatly appreciated.
Thanks in advance.