i am currently trying to set up a Mailcow server, Sending mails works great, receiving mails not so well. As soon as I send an Email from an External email to my Mailcow, I get an email from the server with this error:
`email@example.com: unknown user: “test”
Reporting-MTA: dns; mail.example.de
X-Postcow-Sender: rfc822; firstname.lastname@example.org
Arrival-Date: Sat, 18 Nov 2023 14:10:34 +0100 (CET)
Final-Recipient: rfc822; email@example.com
Diagnostic-Code: X-Postcow; unknown user: “test”`
However, sending mails within the server from one mailbox to another also seems not to work.
How can I fix this?