Internet Redundancy for Exchange Server

Hi experts, I have 2 separate internet WAN links from 2 different ISPs. The WAN links are connected to 2 separate firewalls. 1 FW for each ISP. How do I configure internet redundancy for my servers should one internet fails on 1 link? I want incoming mail and outgoing mail to not be interrupted.
totallypatrickAsked:
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Muhammad MullaCommented:
You will need to set up 2 MX records in your external DNS. One pointing to your primary link IP with a low preference number (high priority) and the second to your secondary link IP with a high preference number (low priority). Outgoing mail will depend on your send connectors in your Exchange setup.
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totallypatrickAuthor Commented:
Yes i have already done that but how do i route to the same server if i have 2 different default gateway without changing manually?
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Muhammad MullaCommented:
If your internal router doesn't have the capability to failover the link you may need to do that manually in case of DR.
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totallypatrickAuthor Commented:
THanks for the help
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