i've had a zero inbox policy since first getting e-mail (late 1970s) - having moved through various systems (roughly once a decade), recently landed on fastmail (which I very very much recommend- extremely fast, but also very easy to migrate to, integrate with other mail systems and calendars (!) and very good support).
so throughout various systems, I've used different tools for managing incoming, and also archives - i have kept all e-mail to/from/cc:d me since 1976:-)
at some point, everything is esentially kept in a bunch of directories (folders) organised with a small (<=3) levels of hierarchy - somewhat like internet name space (.edu .com etc) - with names of people (students) or projects or personal (money, health, house, transport etc)....
not sure what fastmail uses behind the scenes but seems to scale well and has nice rule system for automatically processing incoming too....plus I really like how it interacts with other mail systems ( I have to maintain several outlook accounts for some places I work, and at least one doesn't allow forwarding, but fastmail can pretend to be a client, and make the mail look like it was just got through imap etc)....
anyhow, through various stages (cambridge's ownbrew, then exchange baed system, gmail, and now fastmail) have seen a steady decrease in spam - really very little getting through at all these days (maybe one a day) and very low false positives too ...
but what's left has two things steadily increasing
1/ academic "spam" - e.g. calls for papers, invitations to review, offers to publish my work "for free" (like why would I ever pay?) etc
2/ mandarin - not reading or speaking any version of chinese, I'm assuming this is actually more of 1/ but just for chinese events and publications...
I'm looking for a two stage LLM to deal with those two cases - one "translate", two see if it is relevant - could train the model (or refine/fine tune) based on my own publications or conferences i'm on programme committee for...
maybe a student project!
Anyhow, in my current fastmail setup with 5G of mail, there are only 3 messages in the inbox...soon to be 0.