There should be a website that lets you sign up, enter your current email address and pop/imap information... This "website" is always downloading your email, regardless of whether or not you are logged in, and filters out the spam, forwarding it along to your real inbox.... So it acts as a constantly running filter and at any time, you can log in and look at all the email that has been filtered... And, if you want, mark stuff as "not spam" and continue sending it along... The email that is blocked sends an error message back to the original sender and, ideally, they'd remove you from their spam list.
Wouldn't that work?
Wouldn't that work?