out of place mx records.

Phil Mayers p.mayers at imperial.ac.uk
Thu Oct 28 11:08:37 UTC 2010


On 28/10/10 11:56, Tony Finch wrote:
> On Thu, 28 Oct 2010, Gregory Machin wrote:
>>
>> My question is why would "IN    MX    10    mcvpemr01" and "IN    MX
>>   10    mcvpemr02" be repeated trough the zone file surely this is
>> redundant ?
>
> Some hostmasters like to ensure that mail is not directed to hosts that do
> not listen on SMTP. They prefer misdirected mail to be rejected
> immediately rather than waiting days for the sending system to time out.
> Some of my colleagues have this setup on the zones they manage
> (eng.cam.ac.uk and cl.cam.ac.uk).

We historically did this, for the same reason. We abandoned it recently, 
because it bloated our (already large) zone, and because the majority of 
the inbound email for user at host.domain.com was spam.



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