Multiple A Records - Followup Question

Matus UHLAR - fantomas uhlar at
Mon Oct 3 09:36:53 UTC 2016

>>> IOW, can a given *IP* appear in more than one A record? I realize
>>> that this does have the problem that the reverses would resolve to
>>> hostX not
>>> test

>On 2016-10-02 12:59, Reindl Harald wrote:
>> on IP should only have on PTR - period
>> avoid anything else than PTR/A-matching if the machine is supposed to
>> send outbound mail

On 02.10.16 20:42, David Ford wrote:
>it is very helpful to have multiple PTR records for an IP on a mail
>server so anti-spam engines can accurately make fully verified forward
>and reverse lookups not just for DNS but also certificate verification.
>mail servers that can't correctly emit the right EHLO for outbound email
>should remain in the 1990s.

I found it problematic, not helpful.

It's much safer and easier to have one PTR record with correct fcrdns when
sending mail than having multiple DNS records (even with valid fcrdns).

Matus UHLAR - fantomas, uhlar at ;
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