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

[Pierre Couderc]

On 06/19/2017 08:51 AM, Matus UHLAR - fantomas wrote:
> On 19.06.17 08:03, Pierre Couderc wrote:
>> Ok, thank you all, now I need to understand your answers...
>
> long story short:
>
>>>>> in the "125.124.123.in-addr.arpa" zone:
>>>>>
>>>>> 126   IN   PTR   mail.xxx.com.
>
> quoting your original message:
>> What should I put for IPV4 reverse address : if I put mail.xxx.com, the
>> reverse address will not point on ns.xxx.com, and if put ns.xxx.com, the
>> reverse dns will not point on mail.xxx.com, and I shall have mail
>> problem.
>
> you will not have problem. who told you that?
>
Thnk you, but your way of shortening the story ignores the IPV6. bind 
and MTA are on différent computers, and different IPV6 addresses.
If I do what you say reverse IP for DNS will point on mail.xxx.com and 
not on ns.xxx.com.