Fastmail offers EU data region
fastmail.com
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It’s a good start, but from the article:
If what you need is a guarantee that your data remains only in the EU, we don’t have that, and we’d rather tell you directly than let you assume otherwise.
Even then, what europeans would want is that noone could force them to copy or release it outside of Europe. Otherwise its kind of moot where its stored, if it can be coerced out anyhow.