Kagi and Soverin for me. I bailed from GMail after the AMP-in-mail proposal,[1] and EU hosting was a bonus; ended up blogging about my choice back in 2018.[2] If there was a good EU equivalent to Kagi I’d be definitely interested.

[1] https://blog.google/products/g-suite/bringing-power-amp-gmai...

[2] https://www.robinwhittleton.com/2018/02/18/dropping-g-suite/