I use posteo.net for 10 years now, and I am super happy with them. I don't get spam, and I have never missed an email.
They choose not to use a spam folder system, and I understand their reasoning, and agree with them.
They sometimes get criticized for some other decision (something to do with certificates, if I remember correctly), but after reading their reasoning, I agree with them.
In my experience, they have now real downside, and I recommend them to everyone I know when they come to me with email problems.
Well, there is a simple solution to stop contributing to unnecessary animal suffering. Becoming vegan will not prevent this from happening tomorrow. But at least you (if you are not yet vegan) are no longer responsible for it.