You can delete the spam if you want. It looks like your spam database has been tainted over the years and cannot recognize stuff as definitively spam. I changed the learning script, but it will take a while to correct. Also, it will only train based on my spam database. We'll have to figure out a mechanism so you do your own training. (This may be as simple as putting your spam messages into a folder which gets picked up by a script which does the spam training.) Let's revisit it if you get more spam.