On 15.05.18 22:17, Florian Lindner wrote:
May 15 22:10:04 venus postfix/smtpd[20438]: NOQUEUE: reject: RCPT from 
host[x.x.x]: 450 4.1.8
<florian@horus.localdomain>: Sender address rejected: Domain not found; 
from=<florian@horus.localdomain>
to=<florian.lind...@xgm.de> proto=ESMTP helo=<horus.localdomain>

smtpd_sender_restrictions =
                         permit_mynetworks,
                         permit_sasl_authenticated,
                         reject_non_fqdn_sender,
                         reject_unknown_sender_domain,
                         permit

What could be wrong here?

On 15.05.18 23:12, Florian Lindner wrote:
I understand why there is the Domain not found for horus.localdomain, but not 
why it blocks the delivery, given my
sender_restriction and relay_restrictions.

Am 16.05.2018 um 15:24 schrieb Matus UHLAR - fantomas:
you have reject_unknown_sender_domain in sender restrictions.

your DNS servers don't apparently know "horus.localdomain"
you should better configure proper sender address in source address.

On 16.05.18 20:41, Florian Lindner wrote:
But there is also permit_sasl_authenticated positioned before 
reject_unknown_sender_domain. The sending MTA should
authenticate to the relay host.

as viktor noted, SASL is apparently does announced:
https://marc.info/?l=postfix-users&m=152641898826644&w=2

I would recomment putting reject_unknown_sender_domain BEFORE
permit_sasl_authenticated - othersiwe you must map ALL unknown domain names
to something that works, otherwise you get rejects.

I am pretty sure that the problem is not the relay host, but the sending
machine.  The relay host venus.centershock works just fine as an SMTP drop
off with the usual clients, but the sending postix doesn't even try to
authenticate.

yes, the sending machine is the problem. It uses nonexistent domain in mail
from:
--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
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