Op 11-8-2020 om 16:29 schreef Dietrich:
Sorry to do it in English.
Mein Deutsch ist nich so gut.
I have a Dutch language Thunderbird, but try to explain what you can do.
Choose the newsgroup, so you see the messages.
Click the right mouse button on de.comm.software.newsreader
You see a menu.
At the bottom of the menu I see: "Eigenschappen".
Do not know what you see in German, but I think it's clear.
A window opens.
Then I see a button "Map repareren".
Click on this button and Thunderbird downloads all messages.
Good luck !
Rink