https://mailvelope.com

Mailvelope is a tool to send and receive encrypted messages and files to other users. It uses PGP public key cryptography with a default private key size of 4096 bytes.

Mailvelope already works with many webmail providers:

https://mailvelope.com/en/faq#mailer_list

• Virtual Architects Zimbra
• Gmail
• Yahoo
• Outlook
• Zoho

Mailvelope is a browser add-on that you can use in:

• Chrome
• Edge
• Firefox
• Brave
• Other Chromium based browsers

Versions: https://mailvelope.com/en/products

Wiki: https://github.com/mailvelope/mailvelope/wiki

Tutorial: https://mailvelope.com/en/help

Generate a public and private key pair first. Export both keys and move the file to your back up.