After importing old databases everythimng looks fine now.

But the mail local_recipient maps are not working (/etc/postfix/main.cf looks fine, as before, and postfix was restarted). Mails to test@example.org rejected with Error 550 Recipient address rejected: User unknown in local recipient table

/* as in your installation guide */ transport_maps = hash:/var/lib/mailman3/data/postfix_lmtp local_recipient_maps = $alias_maps hash:/var/lib/mailman3/data/postfix_lmtp relay_domains = hash:/var/lib/mailman3/data/postfix_domains

The files appears to be present: /var/lib/mailman3/data# dir 4 -rw-rw---- 1 mailman mailman 339 Oct 20 21:13 postfix_domains 8 -rw-r----- 1 mailman mailman 12288 Oct 20 21:13 postfix_domains.db 4 -rw-rw---- 1 mailman mailman 2714 Oct 20 21:13 postfix_lmtp 12 -rw-r----- 1 mailman mailman 12288 Oct 20 21:13 postfix_lmtp.db

What else is needed to get the list-addresses working and not rejected? It worked before the import.