[hakfoo]

Well, it wasn't internal traffic, it was communication with a third-party service provider we integrate with, which seems to be maintained by bargain-basement outsourced workers. I'd be unsurprised if their mail server had deliverability problems. Hell, their API test environment has been broken for weeks at a time.

But fundamentally, "deliverability problems" feels like we lost something about the promise of email. I don't have to talk to my postman and tell him "BTW, I'm expecting a box from Mouser next week, make sure you don't yeet it straight into the dumpster."

I suspect filtering is a S-curve thing: you set up a handful of fairly simple rules and get up to 80 or 90% rejections, and then you can spend the rest of your life taming the rest.

But part of the point is to restore some transparency. If you know what filters you have, you can refine them in a better way to get the outcomes you want. Maybe that default block for "Canadian Pharmacy" isn't so useful if you're a medical student looking into job opportunities in Quebec. Being able to manually isolate, understand, and manage the rules is much better than doing rituals to appease the Almighty Algorithm.