Re: [Asrg] IPv6 spam data

* Tim Chown:

> 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.  
Note that the lowest-numbered MX must have an A record, otherwise you
receive bounces from overzealous spam filters.  IIRC, this isn't
mentioned anywhere in the document.
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