Mel,
Its bothersome, but most spam filters have a setting that says :
'only allow mail from these addresses'.
Then you will only get stuff from your friends- but if you contact someone else, or do a business transaction and forget to add them to your list.........well ........they won't get through.
I don't know of any filter that can detect all spam- as spam, if the addresses keep changing (and they do- because the spammers
know how to do it. They keep defeating the system[s]).
My AOL spam filter does a fairly good job with the settings I have set, but I still have to go to the spam box to see if any real mail I wanted, got blocked. Then I retrieve it as 'not spam' but the program doesn't automatically learn from that action.
My medicaL insurance company, and a few of my clients are
always in the spam box.
Technology really hasn't made things all that easier,
they just claim it has.;(