ProtonMail often touts its Swiss jurisdiction and privacy guarantees, but at the same time, it is complying with a record number of data request orders going through the Swiss legal system. ProtonMail is one of the most popular secure email services in the world, having launched in 2014 via a crowdfunding campaign. It promises a …
Tutanota is the only email provider that I know that stores all data encrypted, AT REST.
Due to the nature of email, messages in transit are not encrypted (at least the metadata).
Depending on your risk tolerance, this might be fine.
I would recommend end to end encrypted communication for sensitive information (signal, etc).
Consult privacy guides for the tradeoffs of email and messengers.