On Mon, 18 Nov 2019, siefke_lis...@web.de wrote:
On Mon, 18 Nov 2019 17:23:43 +0100
Matus UHLAR - fantomas <uh...@fantomas.sk> wrote:
cannot find your hostname indicated reject_unknown_client_hostname hit.
Ah thank you this what I had search.
seems something is wrong with your (or maybe their) reverse DNS
resolution...
This is what I had:
[siefke@sisi-dell ~]$ nslookup 195.128.103.214
214.103.128.195.in-addr.arpa name = netcup.silviosiefke.com.
The question is whether your resolver can reverse-resolve the IP address
where the message was coming from, i.e. 81.91.160.182, and not your own
(of your mail server).
$ dig -x 81.91.160.182
office.denic.de. 3600 IN A 81.91.160.182
$ dig office.denic.de
office.denic.de. 3508 IN A 81.91.160.182
which looks OK. See if your resolver also produces the above results.
Cheers.
