ASTIS Mail

Encrypt Gmail/M365 mail, calendar & attachments

Visit site ↗Alternativestop 5% of June 2026

What it does

ASTIS Mail adds client-side end-to-end encryption to Gmail and Microsoft 365 mail, calendars, and attachments—without migration. Business data is encrypted and decrypted on the user’s device; providers route and store ciphertext, while ASTIS servers never receive business data. Automatic key discovery, encrypted calendar invites, B2B organization controls, expiring key capsules, and HYOK make it practical for real teams.

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