Gmail has ben doing this for years, automatically. And it works very well. I think a lot of people don't know the feature exists, though

Gmail's magic algorithms are notoriously unreliable. When they work they work, but when they don't, they really don't. And you won't know, because them not working means you won't get any kind of notification they don't work.

I've gotten direct responses sent to my spam. I've gotten emails, WITH ATTACHMENTS, sent to my spam from a known email address. Its a good thing I check my spam. Many (most?) don't.

Except gmail pretty unexplicably filtered away stuff like a direct response from my boss, to an email I specifically sent to him half an hour ago. After a couple of these hiccups, plus hours spent trying to locate emails that I knew existed and even knew the right keywords for, I just disabled any and all of their filtering (which is, unsurprisingly, not just a checkbox...) and access gmail exclusively through Thunderbird.

It's inexplicable to me how google, of all companies, can be so consistently shit at search across all their products.

Although it really does, the algorithm is outside your control and scrutiny. An artisanal white list is totally under your control, and fully portable. Break the shackles.

This is the main feature I miss from leaving Gmail. 99.9% of email is complete junk not worth ever opening, let alone getting a notification about.

This is probably where I can see the most value from LLMs, the ability to filter all of my emails by urgency without distracting me with notifications from newsletter spam.