Relay access denied?

[knipknap]

I am not sure if this is a problem with the forwarder, or if I am doing somthing wrong: I am using the relay (latest tag from dockerhub) and while the SMTP server is accepting connections, it is refusing to forwarding anything:

$ telnet mydomain.com 25
Trying 1.2.3.4...
Connected to mydomain.com.
Escape character is '^]'.
220 swarm ESMTP Postfix (Ubuntu)
EHLO mydomain.com
250-swarm
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250-SMTPUTF8
250 CHUNKING
mail from: [email protected]
250 2.1.0 Ok
rcpt to: [email protected]
454 4.7.1 <[email protected]>: Relay access denied

From "docker logs" I can see that it picked up the right address though:

>> ENV SMF_DOMAIN not set.
>> ENV SMF_CONFIG found. value:[[email protected]:[email protected]]
>> ARGV arguments found. value:[start]
Generating a RSA private key
....................+++++
......................................+++++
writing new private key to 'smtp.key'
-----
Generating a EC private key
writing new private key to 'smtp.ec.key'
-----
>> SMF_CONFIG found in ENV. use this settings for forward maps.
>> Setting password[j4guss1e] for user [email protected] ...
>> Set hostname to mydomain.com
>> Start self-testing...
1..17
ok 1 SMF_CONFIG exist
ok 2 SMF_DOMAIN exist
ok 3 virtual maping source is set
ok 4 virtual maping data is set
ok 5 virtual maping db is set
ok 6 system hostname FQDN resolvable
ok 7 postfix myhostname FQDN & resolvable
ok 8 check other hostname setting
ok 9 confirm postfix is running
ok 10 confirm port 25 is open
ok 11 crond is running # skip skip this for 0.3.0 -> 0.4.0
ok 12 ESMTP STATTLS supported
ok 13 ESMTP AUTH supported
ok 14 ESMTP STARTTLS connect ok
ok 15 create user [email protected] by password test
ok 16 ESMTP AUTH by [email protected]/test
ok 17 ESMTP TLS AUTH by [email protected]/test
>> Test PASSED

>> CONGRATULATIONS! System is UP and You are SET!
>> Powered by SMF - a Simple Mail Forwarder
>> View in DockerHub: https://hub.docker.com/r/zixia/simple-mail-forwarder

>> Init System for Servicing...
[s6-init] making user provided files available at /var/run/s6/etc...exited 0.
[s6-init] ensuring user provided files have correct perms...exited 0.
[fix-attrs.d] applying ownership & permissions fixes...
[fix-attrs.d] done.
[cont-init.d] executing container initialization scripts...
[cont-init.d] done.
[services.d] starting services
[2020-06-28T11:25:59.336248] WARNING: Configuration file format is too old, syslog-ng is running in compatibility mode. Please update it to use the syslog-ng 3.13 format at your time of convenience. To upgrade the configuration, please review the warnings abo
ut incompatible changes printed by syslog-ng, and once completed change the @version header at the top of the configuration file.;
Jun 28 11:25:59 ab42f73c81fc syslog-ng[508]: syslog-ng starting up; version='3.13.2'
[services.d] done.
Jun 28 11:25:59 ab42f73c81fc postfix/postfix-script[530]: stopping the Postfix mail system
Jun 28 11:25:59 ab42f73c81fc postfix/master[99]: terminating on signal 15
Jun 28 11:25:59 ab42f73c81fc postfix/postfix-script[578]: warning: not owned by root: /var/spool/postfix/.
Jun 28 11:25:59 ab42f73c81fc postfix/postfix-script[579]: warning: not owned by root: /var/spool/postfix/pid
Jun 28 11:25:59 ab42f73c81fc postfix/master[597]: daemon started -- version 3.3.0, configuration /etc/postfix

Any idea?