DNS roundrobin

If i take accounts on 2 companies for shared(virtual) hosting....what all do i need to enable round robin from my domain name?

mean, i have the same site on both servers...when somebody goes towww.mydomain.com, they are randomly, or alternatingly directed to each servers to balance load and introduce fault tolerance.

Doing this, can i still use a custom MX record?

-thanks.

 

 

 

 

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