reverse dns configuration for IPV4, IPV6+ dns+ mail ?

Pierre Couderc pierre at
Mon Jun 19 07:44:28 UTC 2017

On 06/19/2017 01:05 AM, Reindl Harald wrote:
> Am 18.06.2017 um 17:38 schrieb Matus UHLAR - fantomas:
>> On 18.06.17 16:26, Mark Elkins wrote:
>>> Put two reverse records in both  the IPv4 and IPv6 reverse zones....
>>> in the "" zone:
>>> 126   IN   PTR
>>> 126   IN   PTR
>> while this is possible, it's not always a good idea.
>> One reverse record is enough in most cases you need reverse DNS.
>> (which mostly means, for outgoing mail)
>>> Nothing wrong with a machine (or interface on a machine) having more
>>> than one name for the same address. List them all in the reverse
>>> configuration. After all, a NS record usually has at least two 
>>> records ;-)
>> there are cases when having two reverse records is misleading
> it's nearly always misleading and results in randomness on the 
> receiving server which name get logged and if A/PTR matches
> normally you should always have:
> * IP with *one* PTR
> * the A-Record for the PTR matches
> * smtp_helo_name of your MTA matches the same name
This is clear in IPV4 but what about IPV6 ?

If I declare bind :

mail A
mail AAAA 2a01:e34:xxxx:xxxx:xxxx:xxxx:1122:3344

ns A
ns AAAA 2a01:e34:xxxx:xxxx:xxxx:xxxx:aabb:ccdd

What should I put for IPV4 reverse address : if I put, the 
reverse address will not point on, and if put, the 
reverse dns will not point on, and I shall have mail problem.

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