Are there any settings that may help with making it easier seeing spam as spam? E.g. some mail programs, including Outlook, allow the user to set a from mail address that most mail clients will show instead of the true sender address, but the senders mail address is still present in the sender header field. While some people and companies carelessly abuse that functionality, hiding their true mail address, those bad practices also are abused my spammers and others. Does mailman have any settings that would remove any such obfuscations, e.g. in this case detect the manipulated from address and replace it with the sender address?
While I do run my own spam filter, it's virtually getting harder every day to make sure you detect all spam while not having too many false positives. If it was possible to reverse at least the most obvious manipulations, that would probably already help. Also, it would make it much easier for the users to see at first glance who actually wrote an email. It's always less trustworthy if the senders address is shown as user3168@suspiciousdomain.gg instead of it being manipulated to say support@yourprovider.com.