Mailvelope
Open SourceMailvelope is a free and open-source browser extension for Chrome and Firefox that brings end-to-end encryption to your existing webmail services using the OpenPGP standard. It allows users to encrypt, decrypt, and digitally sign emails directly within their web browser, enhancing privacy and security without requiring a change in email provider.
Key Features
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Integrates directly with existing webmail services.
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Uses the widely adopted OpenPGP standard for encryption.
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Encryption and decryption handled client-side in the browser.