Hey yall, 

I just found out that there is a dedicated OpenSMTPD mailing list, so I will 
my issue here also.

Thanks for any help!

Date: Sun, 12 Sep 2021 23:28:07 +0200
From: Simon Hoffmann <open...@simonhoffmann.net>
To: m...@openbsd.org
Subject: OpenSMTPd: Ignoring /etc/hosts file?

Hey yall, 

in my smtpd.conf file I have "relay smtps://host.domain.tld"

host.domain.tld does resolve to a public IP, and this needs to be a public IP on
public DNS.
However, OpenSMTPd needs to relay to the local IP address of the smarthost.
Since I have no DNS server running on that network, and i dont want to setup a 
server only for OpenSMTPd, I added an enty to /etc/hosts, assigning the local 
IP to
the FQDN.
When i ping the FQDN it correctly resolves to the internal IP of the smarthost.
However, OpenSMTPd ignores the entry in /etc/hosts and still tries to connect 
to the
public IP of the host.

Is this known that OpenSMTPd ingores /etc/hosts? Or is this a problem on Debian?
Is there a workaround? Specifying "relay smtps://" will not work, 
as the
private IP is not part of the Cert. 
Can I force OpenSMTPd to use the internal IP? Can I disable Cert checking for 


System details:

root@mx01:~# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 11 (bullseye)
Release:        11
Codename:       bullseye
root@mx01:~# smtpd -h
version: OpenSMTPD 6.8.0p2
usage: smtpd [-dFhnv] [-D macro=value] [-f file] [-P system] [-T trace]

root@mx01:~# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug ens192
iface ens192 inet dhcp

Any info else you need?



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