Consider creating the following filter rules in webmail to move these misidentified spam emails to holding folders and when confident the rules are working as intended change the holding folders to your Spam folder.
NB: foo\.lan is a placeholder where exception can be added for mailing lists you wish to receive, for instance if example.com is to be exempt then append the highlighted text: foo.\lan|example\.com
NB: some recent spam emails have a malformed Date header value of Wed4 Oct 2020 18:44:07 -0400 that the above rule matches.
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