'Safe' is a bit too vague: what are you looking for?

• If you just need an email that doesn't belong to GAFAM and is not subjected to US privacy-less laws but need no extra security (no end to end encryption): Infomaniak KSuite(Swiss) is available both as a free plan (20GB email + 15GB Cloud free) and as a paid version (unlimited email storage and 1To Cloud). They also offer just the email, if you don't need cloud: Kmail ;) . There is also mailbox.org (Germany)
• End to end encryption: Tuta (German), Proton (Swiss).

Edit: moved mailbox out of the E2EE section.