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Using 1.1 MARIADB edition
Ubuntu 18.04
Used downloadable installer following guide
Mysql storage
Nginx
Not using iredadmin-pro
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Mar 11 07:58:59 mail postfix/smtpd[26257]: NOQUEUE: reject: RCPT from mailout-taastrup.gigahost.dk[46.183.139.199]: 554 5.7.1 <dns@crewplan.dk>: Recipient address rejected: SMTP AUTH is required for users under thi$

I created an entry in forwardings with the query below.
MariaDB [vmail]> INSERT INTO forwardings (address, forwarding, domain, dest_domain) VALUES ('crewplan.dk','mark@crewplan.dk','crewplan.dk','crewplan.dk');

But when I try to send to a non-existing address it is not delivered - see error in log above.

Any advice would be appreciated very much.

Best regards,
Mark