Hi I have two domains they both have a A records to the same ubuntu server with plesk.
One of the domains uses a mail Server on the same ubuntu plesk server. The second domain has its dns mx record to a different hoster.
Now when I send a mail from the Mail which is hosted on the ubuntu plesk server to the second (external server) I got an error message.
What I think is the mail is transferred internally on the server and there is an error. I set the DNS records in plesk for to the external mx ...
what could be the issue?
Thanks in advance.
Error Message:
Ihre Nachricht hat einige oder alle Empfänger nicht erreicht.
Betreff: test von Felix
Gesendet am: 24.09.2018 19:23
Folgende(r) Empfänger kann/können nicht erreicht werden:
'[email protected]' am 24.09.2018 19:23
Serverfehler: "550 5.1.1 <[email protected]>: Recipient address rejected: User unknown in virtual mailbox table"'