Am 19.06.2017 um 15:25 schrieb Matus UHLAR - fantomas:
* smtp_helo_name of your MTA matches the same name
this one is incorrect and my next comment applies only to this one:
On 19.06.17 15:14, Reindl Harald wrote:
does it harm? NO
is it easy to achive? YES
can it be used for scoring on a spamfilter? YES
is it required? NO.
so what - is FCrDNS required? NO
is it best practice? YES
can it be used for scoring on a spamfilter? YES
FRANKLY i have seen enough *real world* postfix rejects caused by
"check_reverse_client_hostname_access" because the idot on the other
side had "mail.example.com" AND the old
"my-provider-xx.xx.xx.xx-dyn.crap" PTR where one time
"check_reverse_client_hostname_access" was fine because it dealed with
the "mail.example.com" and the next mail was rejected by match
"my-provider-xx.xx.xx.xx-dyn.crap"
those rejections were NOT caused by having two different PTRs.
They were caused by something different that is not a subject of this
thread - even one PTR of this format would cause rejections.
not directly but by the fact that someone was smart enough to reqest a
sane PTR and nother one was not somart enough to remove a useless one,
by just follow "1 IP has exactly 1 PTR - period" that never would have
been possible
in all of these cases just remove the old useless generic PTR would
have solved the problem from the start
so please inform yourself and do tests.....
go reread the OP's question. He asked about "ns" and "mail" records.
there's no need to comment something noone did propose
since DNS don't care about the PTR but mail does what is your problem
that you need stupid dicussions instead just agree that it can't do harm
and in doubt is beneficial to have just one hostname, use that one
hostname in helo_name and have just one PTR pointing back to that hostname?
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