Geert Hendrickx via Postfix-users:
> 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.
And when there is no valid MX record, you'd have to look up all of them?
Wietse
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