Am 28.01.2019 um 17:29 schrieb Oliver:

If I want to use Vibenews with (the content of) an external NNTP server, I have to synchronize the messages between the external NNTP server and the Vibenews NNTP?

This is currently not supported. It's generally not something that
couldn't be added, but the original scope of VibeNews was just to create
a stand-alone web forum with NNTP client support.

I'm not sure whether something like that exists, but as a workaround the
messages from the external server could of course be pushed to the
VibeNews server instead of having it pull.