Am 19.06.2017 um 08:49 schrieb Matus UHLAR - fantomas:
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
should != required
it's best practice
anyways, with 2 PTR records for the same IP on servers with
http://www.postfix.org/postconf.5.html#reject_unknown_client_hostname
you play lottery because one time it's logged as unknown and the other
time as matching, the unknown cases would trigger
reject_unknown_client_hostname
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