> On 2021-04-29 10:25, Matus UHLAR - fantomas wrote:
On 29.04.21 06:25, Fourhundred Thecat wrote:
Postfix does not show hostname for a connecting IP address, when the
hostname does not have reverse lookup:
Example from my log:
warning: hostname zg-0416b-243.stretchoid.com does not resolve to
address 192.241.220.141: Name or service not known
connect from unknown[192.241.220.141]
timeout after EHLO from unknown[192.241.220.141]
disconnect from unknown[192.241.220.141] ehlo=1 commands=1
It is a good thing that postfix warns me that hostname does not resolve
back to the IP, but why does it show:
connect from unknown[192.241.220.141]
instead of
connect from zg-0416b-243.stretchoid.com[192.241.220.141]
The IP has DNS record, so even when reverse does not work, I would like
to see the hostname that is connecting
can this be configured?
no. There's no poing in trusting reverse lookup if it's not
forward-confirmed.
Anyone can poing their reverse DNS to any domain they don't own.
when I query the IP with "host" command, I get:
$ host 192.241.220.141
141.220.241.192.in-addr.arpa domain name pointer
zg-0416b-243.stretchoid.com.
same when I do it in my python script using gethostbyaddr()
Can't postfix be configured to do it similarly ?
Get proper reverse/forward name, possibly not generic.
what do you mean? I don't control these IP addresses.
These are just connecting to my mail server
