[Asrg] IPv6 spam data

[der Mouse]

> If people want advice on dual-stack MX setup, see RFC3974.   This
> document is 3 years old, but I believe what it says is still
> considered best practice.

Most of it, perhaps, but I'm not sure I agree with all of section 3
step (9).  In particular, fallback to next MX rather than next address
broke; I had to split my dual-stack MX into two MX records, each
single-stacked but referring to the same actual machine, because of it.

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