rspamd vs. "Anacron job 'cron.weekly' on hostname"

rspamd says spam because:

FROM_INVALID (2)
MISSING_MIME_VERSION (2)
FORGED_RECIPIENTS (2) [m:,s:cweiske@cweiske.de]
FORGED_SENDER (0.3) [root,root@dojo.home.cweiske.de]