@MDonaldson Oh, I'll keep any eye for that. I use the username+growth@gmail.com trick. Then I only have to set up one rule for +growth@gmail.com 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.