@nebulon , thanks for reply.
in the first post, I copied a undeliverable testmail from spamhoaus to cloudron, b/c it was denieing the reception.
here a little oversight:
[image: 1720004240958-2024-07-03_12-50_cldrn_mail_deliv-fail.png]
and they all look similar…
[image: 1720004260697-2024-07-03_12-52_cldrn_mail-deniedy.png]
all these hosts are N.O.T. blacklisted. I checked.
also, false positives…