On 18.06.17 15:40, Pierre Couderc wrote:
Well, we have 2 computers in xxx.com subnet provided by ISP on 123.124.125.126 
ipV4  address and corresponding IPV6 segment

mail.xxx.com :    2a01:e34:xxxx:xxxx:xxxx:xxxx:1122:3344 for mail server
ns.xxx.com :  2a01:e34:xxxx:xxxx:xxxx:xxxx:aabb:ccdd for dns server

In xxx.com bind :

mail A 123.124.125.126
mail AAAA 2a01:e34:xxxx:xxxx:xxxx:xxxx:1122:3344

ns A 123.124.125.126
ns AAAA 2a01:e34:xxxx:xxxx:xxxx:xxxx:aabb:ccdd

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 mail problem. How did you come to this conclusion?
put there either one you want.

I would prefer mail.* but anything that does have valid A record pointing
back to 123.124.125.126 is fine.

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