[guy_c]

I think the only email services that are not going to mine your emails for valuable data are paid services that have made strong commitments to privacy. This was an interesting podcast interview with founder of Fastmail https://overcast.fm/+Hbyc810T0

[username444]

I was about to counter that self hosted is an option, but that doesn't technically qualify as an "email service".

I'll note that the privacy centric services are only good as long as they're still maintained by a founder... you trust. If things go sideways, they can always be "acquired".