Hi,

I tried to set up Gnus with the help of:

https://www.bounga.org/tips/2020/05/03/multiple-smtp-accounts-in-gnus-without-external-tools/

and after changing the settings it worked partially.

It took only emails from one email provider, but not from the other (may 
be I have to fiddle around in my settings).

But what astonishes me:
it took in "groups" only 55 folders (which I have set up in my email 
provider "posteo" instead of more than 100.
So I don´t know why it took only a part of it.

May be as Jean Louis wrote it can´t handle more.

Regards

Gottfried