A Script That Redirects Pages To Different Domains When One Page Is Dead

What I want to achieve is described in the below scenario.

I want to send out via email a Subscribe Link Page with a script attached to it( the Subscribe Link page contains a short note and a Weblink).
This Weblink when clicked takes visitors to Page A on Domain H

When Page A on Domain H is deleted,
I want the script attached to the Subscribe Link page to redirect visitors to another copy of Page A but on Domain T and I want the process to repeat itself if Page A on Domain T is deleted.

I will be using at least 5 domains to keep Page A alive.

This is because I want Page A to be up for at least 2 weeks.

What I have described above is a crude solution, I will welcome any other solution you may have that does the above and more.

Thank you