X-Postcow; unknown user: "test"

mariusamstart

Hi,

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:

`test@example.de: unknown user: “test”
Reporting-MTA: dns; mail.example.de
X-Postcow-Queue-ID: DC501ED96C
X-Postcow-Sender: rfc822; max@mustermann.email
Arrival-Date: Sat, 18 Nov 2023 14:10:34 +0100 (CET)

Final-Recipient: rfc822; test@example.de
Original-Recipient: rfc822;test@example.de
Action: failed
Status: 5.1.1
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?

esackbauer

You are right, do not look at the rspamd or postfix logs of your server. Also do not check if the MX record is set up properly 😉

mariusamstart

So, i fixed it. Postfix did not like my entry into the “mydestination” in the Postfix config. I removed it and now it works fine. Actually I added something to mydestination because Postfix had a problem with something else but that error also disappeared.

Thanks esackbauer for the tip 🙂