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?

Am 15.05.2018 um 22:29 schrieb Benny Pedersen:
its a dns problem to solve, not postfix

# /etc/hosts

127.0.0.1 horus.localdomain horus

Benny, 127.0.0.1 should always resolve to "localhost" (surprises can happen
otherwise). That's why debian puts local host name with IP 127.0.1.1 to /etc/hosts.


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.

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.

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