The last week, every single day, any time I logged into my email I unsubscribed from all newsletters I received.
I'm now unsubscribed from about 95% of them though a few new ones do trickle in once in a while.
WOW, it makes a huge difference.
It's the best feeling in the world logging into your email and not seeing a ton of clutter that's all vying for your attention.
This is an exercise I highly recommend.