yes, as said reject_unknown_client_hostname is relatively strict, one
needs to set an exception now and then if the server is legit in the end...
but it's not legit requests more often...
https://www.postfix.org/postconf.5.html#reject_unknown_reverse_client_hostname
On 21/09/2023 21:06, David Lang wrote:
hmm,
dlang@dlang-mobile:~$ nslookup 66.167.227.145 8.8.8.8
145.227.167.66.in-addr.arpa name = mail.lang.hm.
Authoritative answers can be found from:
dlang@dlang-mobile:~$ nslookup mail.lang.hm 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
Name: mail.lang.hm
Address: 66.167.227.134
On Thu, 21 Sep 2023, TG Servers wrote:
this is a standard reject_unknown_client_hostname from postfix, this
is relatively strict, but ususally no problem on clean servers, I
have only a handful exceptions
this is not the IP you sent from...the mail came from 66.167.227.145
cannot find your hostname, [66.167.227.145]; from=<da...@lang.hm>
to=<sr...@prvtmail.net> proto=ESMTP helo=<mail.lang.hm>
Thomas
On 21/09/2023 11:00, David Lang wrote:
On Thu, 21 Sep 2023, TG Servers wrote:
I did not get a single message from you David regarding
that, that confused me quite a bit as Rainer mentioned you already
before, now I know why :
450 4.7.25 Client host rejected: cannot find your
hostname, [66.167.xxx.xxx]; from=<da...@lang.hm>
to=<sr...@prvtmail.net> proto=ESMTP
helo=<mail.lang.hm>
made an exception now
hmm, I haven't made any DNS changes or IP changes for a couple
of years (since the last time my ISP broke reverse DNS)
lookups against google DNS servers seem to work
dlang@dlang-mobile:~$ nslookup mail.lang.hm 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
Name: mail.lang.hm
Address: 66.167.227.134
dlang@dlang-mobile:~$ nslookup 66.167.227.134
134.227.167.66.in-addr.arpa name = gw.lang.hm.
Authoritative answers can be found from:
what is the check that you are doing? I'm not running into
problems with anyone else that I know of.
David Lang
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