Too expensive for 16gb ram and sadly I don’t think it’s fully the pi’s fault. It just uses one of the most in demand chips right now

Fastmail , I am liking them more than Tuta and they are pushing the newer better jmap protocol.

I recently switched to a custom domain and it’s probably the best 12 bucks a year to spend. If you ever have to switch email providers for whatever reason it’s super easy because the domain is yours and you just need to update DNS records to your new email provider rather than updating your email address on tons of separate sites