On Tue, Oct 21, 2025 at 18:44:47 +1100, Viktor Dukhovni via Postfix-users wrote:
> Otherise, having one or two neglected stale MX records mixed in with
> other working records is sadly a mistake that some senders may not
> notice. And on the other hand resolving the A and AAAA records of every
> single MX record can be quite expensive, without a concurrent DNS lookup
> service.
You don't have to lookup *all* of them, you can stop as soon as one valid MX
record is found, so the vast majority of cases would only need a single extra
lookup.
Geert
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