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I have two E-mail servers. Primary Exchange 2007 mail server is in my organisation, and secondary E-mail server is hosted on Google using Google Apps. Sometimes, our primary mail server goes down, and all our mail is sent on Google servers. What I want to do is to automatically forward (or resend) all E-mail messages from secondary mail server to our primary mail server when primary mail server goes up, so users don't have to go on gmail account.

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Is your Exchange onsite? –  George May 16 '12 at 15:42
    
Yes my Exchange is on site! –  Mr.M May 16 '12 at 15:50
    
Did you ever find a way to do this? –  user138957 Sep 29 '12 at 5:32
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1 Answer

I am not sure what your requirements are. Are all users using Outlook or OWA?

If the Google Apps part really is not needed I would instead set up a postfix as secondary mx and queue up until the primary exchange is available again and the forward all mails from the secondary.

A better solution, but expensive is using at least 4 Exchange servers, 2 fronts and 2 backends. (Actually with Exchange 2010 you would probably need 5. 1 TMG, 2 CAS and 2 DB).

Put the TMG on a high availability solution like VMWare.

Still with that solution a secondary MX to collect when the internet line is down could be needed.

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All users are using Outlook. Probably there is better solution :) –  Mr.M May 16 '12 at 17:40
    
Anyone please come on! –  Mr.M May 17 '12 at 17:36
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