Hello everyone!
I have configure my postfix like this configuration here:
https://docs.mailcow.email/manual-guides/Postfix/u_e-postfix-unauthenticated-relaying/
I have added my second mailserver (behind mailcow) to the mynetworks and restart the container.
After sending out emails i get the following bounce back from mailcow:
Remote Server returned ‘554 5.7.1 This message does not meet our delivery requirements’
So I also stored the IP in the mailcow gui within the forwarding hosts setting. If I switch off the SPAM filter with this option, I can now send e-mails.
However, there is a problem, all outgoing emails from this system are then NO longer DKIM signed, why?
In addition, the emails then have this strange X header:
X-Rspamd-Pre-Result: action=no action; module=Unknown lua; ip matched with forward hosts
It wasn’t there before the update either!
If I switch on the SPAM filter, the e-mail is apparently treated like an external e-mail and rejected.
This has only occurred since the last update. Any ideas? Docker is already up to date.
Is it possibly a bug?