I use Mailwasher "with" Eudora -- works just fine!
I say "with" because the two programs are actually separate:
- I have Mailwasher check my POP server to see what e-mail is waiting there for me.
- Mailwasher filters out/bounces the SPAM, but lets the good e-mail remain on the POP server.
- I then use Eudora to download the remaining "good" e-mail.
I imagine this would be the same with Pegasus.