Easy peasy my friend. Divide and conquer. I open all the mail, sort out the garbage from the important stuff. I throw away all the chaff and bullshit, sort that into important stuff that needs attention, and important stuff that needs to be kept track of.
I then throw the important stuff that needs to be held onto but requires no action, into a box with the year (or at least a year within the last 3 years) written on the side. And then every 5 years or so I throw away the old boxes.
At that point, what's left is just a few pages per week that I then give to my spouse so they only have a couple of things to deal with.

They then take those couple of pages and put them on top of the ever looming pile of toxic things that we will never dare to touch again.

However, this pile is strategically placed so that it can't be missed, and acts as an anxiety point that drives us to do other tasks that would normally be avoided, but now seems like a nice diversion in the shadow of "the pile".

Or at least that's the way it used to work, but now we just avoid that room completely.