OK, I have changed spam assassin to not save copies of messages which are auto-deleted, or marked as spam.
There are just TOO many to realistically expect any possibility of ever going back through and verifying there wasn’t a false reject.
On the bright side, messages have to get a pretty high spam score to be rejected. The worst false positive should STILL deliver the message to your inbox, encapsulated in a warning message. Let me know about any of those sorts of messages.