[nh2]

Gmail's spam filtering has a high false positive rate.

It classifies Stripe's and PayPal's important security emails as spam; I posted previously on HN:

https://news.ycombinator.com/item?id=19536465

It's easy to bring down the number of false negatives if you allow the number of false positives to be arbitrarily large.

On my GSuite business email, I've had > 50 incoming business-relevant emails this year that were incorrectly classified as spam. My personal self-hosted email server [1] lets through a bit more spam than Gmail, but it also doesn't suffer this big false-positive rate.

[1]: https://nh2.me/recent/Running-your-own-mailserver.pdf