In Traefik Log it looks like the roundcube Webpage is blocking this rspamd access
2024-10-11T09:06:26+02:00 [1:traefik1:traefik] 192.168.11.11 - - [11/Oct/2024:07:06:26 +0000] "GET /rspamd/ HTTP/2.0" 403 285 "-" "-" 1118 "roundcubemail1-https@file" "http://127.0.0.1:20012" 2ms
Maybe similar to (/rspamd/ not found - #6 by davidep)