If they all point to much the same cluster of servers, it simply means those servers get retried two or three times per set of MX lookups. It is a quick and dirty hack but well, it works fairly fine without treating a single failure as a timeout and having to fallback to a different set of hosts + come back later. All your MX hosts are available to receive SMTP connections this way.
> On 30-May-2015, at 1:51 am, John R Levine <[email protected]> wrote: > > They're not exactly the same, but they're almost all the same. Each actual A > record has at least three names. I understand why you'd want to do load > levelling, but it's hard to imagine any sensible reason to use the same A > record on more than one MX.
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