@MDonaldson Oh, I'll keep any eye for that. I use the email@example.com trick. Then I only have to set up one rule for +firstname.lastname@example.org and I always sign up for newsletters with that variation. I wouldn't mind having a bit more distinction between them all though. Really I'd love a client or RSS that felt like it was made only for newsletters but haven't seemed to come across any such thing.
P.S. I listened to Kate NV as per your recommendation: very good.