after a summer break and some updates my beloved emailserver is telling me:
postfix/smtpd: NOQUEUE: reject: RCPT from unknown[172.17.0.3]: 550 5.1.1 <email@example.com>: Recipient address rejected: User unknown in virtual mailbox table; from=<firstname.lastname@example.org> to=<email@example.com> proto=ESMTP helo=<host.mydomain.de>
Is some able to point me in some direction?
The setup is an old howto: having ox_app_suite on another server than the univention-mail-app.
This was working for some years now. Anyway: the message is independent from the client I’m sending email with.
I see some changed files for the ldap connection in the postfix files on 9.8.23 - maybe related?
Internal emails are still delivered.