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

[Pierre Couderc]

On 06/19/2017 10:42 AM, Matus UHLAR - fantomas wrote:
>
>> If I do what you say reverse IP for DNS will point on mail.xxx.com 
>> and not on ns.xxx.com.
>
> I have asked you twice:
>
> WHO TOLD YOU THIS IS A PROBLEM? IT IS NOT!
>
> There are only a few services on the net who currently use reverse DNS
> records. SMTP is the most important. DNS servers do not check that.
>
Thenk you, I had read that somewhere but I may have bad understood and 
you answer me clearly. It is NOT a  problem. Thank you.