Hi,

Can someone give me a brief rundown (or links) to explain what MX is all about?

I have a website and ideally I would like to setup a sytem whereby if the host goes down, I can still receive email via a 'backup host' system. What would be required to set this up?

Thank you.

This should cover it ;) :

http://www.google.co.uk/search?sourceid=navclient&q=what+is+an+MX+record