reverse dns configuration for IPV4, IPV6+ dns+ mail ?
Matus UHLAR - fantomas
uhlar at fantomas.sk
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 "125.124.123.in-addr.arpa" zone:
>>>126 IN PTR mail.xxx.com.
>>>126 IN PTR ns.xxx.com.
>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 fantomas.sk ; http://www.fantomas.sk/
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