Private Relay Alternatives

Private Relay is described as 'Secure (encrypted) and private (doesn't data mine or read users emails) email alternative to Gmail, Outlook, Yahoo, etc. Offers not only email support, but you store contacts, calendar events, and tasks through Exchange, IMAP, POP, etc' and is an website in the Security & Privacy category. There are more than 10 alternatives to Private Relay, not only websites but also apps for a variety of platforms, including iPhone, Android, iPad and Self-Hosted solutions. The best alternative is ProtonMail, which is both free and Open Source. Other great sites and apps similar to Private Relay are Tutanota (Free Personal, Open Source), Posteo (Paid, Open Source), mailbox.org (Paid) and Mailpile (Free, Open Source).