Re: split the load?

> Don't DNS implementations have the option of ordering MX

Not that I know of ....

> and A record returns based on a sorting criteria such as network preference?

yes.

I don't remember seeing such code in BIND for MX RRs.
Nor can I see it being useful, or implementble based on "network".


The suggestion is to randomise the *MX* RRs, not the *A* RRs ..