[Evolution] All Mails filtered as spam

[Michael <dennismail gmx net>]

Hello there,

I am using Evolution 3.28.5 (3.28.5-3.fc28).
Since some days, all mails in "Posteingang" (="Inbox") are
automatically filtered into folder "unerwünscht (="Spam").

I am using quite some filters (30+), so to make sure none of these are
the ones that are "guilty", I deactivated all of them. Still, all mails
are filtered to spam. Is there anywhere else I have to look?

Greets,
Michael