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

Matus UHLAR - fantomas uhlar at
Mon Jun 19 06:49:09 UTC 2017

>>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

>Am 18.06.2017 um 17:38 schrieb Matus UHLAR - fantomas:
>>there are cases when having two reverse records is misleading

On 19.06.17 01:05, Reindl Harald wrote:
>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

Even this is not required. In fact, requiring this breaks SMTP RFC.
The only requirement on helo name is that host must exist and be canonical,
which means it has to point to A or AAAA record.

Matus UHLAR - fantomas, uhlar at ;
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