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K-9 Mail

K-9 Mail is a long-standing open-source email client for Android focused on security, transparency, and user control. It supports IMAP and POP3 accounts, integrates with OpenPGP for encrypted email, and contains no tracking, ads, or proprietary analytics. Ideal for users who want a trustworthy local email client without relying on closed ecosystems.

Alternative to: Gmail and Outlook
Encrypted Android Open Source No KYC required
Visit Website GitHub
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About K-9 Mail

K-9 Mail is a long-standing open-source email client for Android focused on security, transparency, and user control. It supports IMAP and POP3 accounts, integrates with OpenPGP for encrypted email, and contains no tracking, ads, or proprietary analytics. Ideal for users who want a trustworthy local email client without relying on closed ecosystems.

Key Features

  • Fully open-source and transparent codebase
  • End-to-end encryption for secure data transfer
  • Android app support for mobile privacy use
  • Secure email workflows with strong account protection
  • Auditable source code enables community-driven security reviews

Useful Links

Official Website GitHub Documentation
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