internet mail as backup to exchanger server 2013

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.
charlojedeAsked:
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
"The internet server should actually kick in anytime the in-house server fails"

This is the problem.
That isn't really possible easily if you want to continue to have email delivered directly to Exchange. There are plenty of hosted solutions which can do what you want, where they will deliver the email, if that fails they will store the email.
In-house, the most you can easily do is use IIS SMTP to forward the email, to Exchange. However you will need to protect it and use something for recipient validation etc.

Simon.
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schooltechnicianIT & Network Systems ManagerCommented:
Think you are looking for something like this:

http://www.mxsave.com/services-backup-mx.html

You can also host it yourself on a hosted server running hmailserver or alike program.
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