I used now the syncing method as described in the documentation.
With this method the interfaces won’t come up.
So I changed them to a other IP via the following commands and restarted the network
Afterwards I changed both again with
db networks setprop enp0s3 ipaddr 192.168.10.1
Looks much more better now.
- Mailconfig is all changed from IMAP to POP3 at POP3-Connector
I give an update with other problems and solutions as far as I have checked it