Emailing a Newsletter. Looking for a way to send to an alternate webserver if first one is down

We email newsletters and ads for multiple companies
We are looking for a way to ensure that when the recipient clicks on a link in the newsletter they will get the information either from the primary website or from a secondary website
For example if the link points to domainnameA.com and that site is down it will automatically go to domainnameB.com.
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emery_kAsked:
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Richard QuadlingSenior Software DeveloperCommented:
As you cannot change the actual address in the request (the URL in the email), you have to have some sort of fall over support with your ISP.

I would talk to them.

A few things.

1 - Sync. Make sure both servers are upto date. Any changes you make to one server have to be mirrored.
2 - Separate web and DB servers. This allows a cluster of web servers to work with a cluster of DB servers. Syncing each type is done within the cluster.
3 - Buy this service from someone like akamai.

If you have real time access to the DNS data for the 2 domains, then you could have a little script running which examines the state of domain A and if it cannot find it, alters the DNS to domain B.

This should alert you or your admin people to take a look at the problem.

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emery_kAuthor Commented:
I'd not really expected a good solution as I'd researched this prior to asking
Even with a script to change the DNS it would be down for the time it took to propagate
Possibly a way using dynamic dns but still not what we were hoping for
(I could ask for winning lottery numbers too couldn't I)
Thanks for the comments though
Richard QuadlingSenior Software DeveloperCommented:
If you get the winning numbers, I want half.
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