Skiff, the private email provider has been acquired by Notion. It is set to shut down its services after 6 months.
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Skiff - Private, encrypted, secure email - 10 GB free
https://skiff.com/
Skiff Mail privacy-first, end-to-end encrypted product home, with Mail, Calendar, Pages, and Drive overview.
All skiff users have received a mail in this regard and Skiff has also tweeted about the same.