I want Proxmox and other systems or services on other computers to send via Kopano mails on errors. I followed the howto from: https://wiki.univention.de/index.php?title=Mailrelay_unter_UCS
Obviously I missed some configuration parameters because neither the mail relaying for other machines nor mailing on the localhost (via webinterface) is working.
In the logfile following error occurs:
NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 454 4.7.1 email@example.com: Relay access denied; firstname.lastname@example.org email@example.com proto=ESMTP helo=<ucs.domain.tld>
Any ideas on that?
After double-checking the UCR parameters and correcting them