About
K-9 Mail is an open source email client that supports multiple accounts and works with basically every email provider. It offers a unified inbox, automatic background synchronization or push notifications, and both local and server-side search. The app is privacy-friendly with no tracking—it only connects to your email provider. For users who want to encrypt their emails, K-9 Mail supports OpenPGP email encryption (PGP/MIME) when used with the OpenKeychain app.
Highlights
- Multiple account support with unified inbox view
- OpenPGP email encryption (PGP/MIME) with OpenKeychain integration
- Automatic background synchronization or push notifications
- Local and server-side email search
- Privacy-focused with no tracking, connects only to your email provider
Best for
Users who want a privacy-respecting email client that works across multiple email providers and supports encrypted messaging through OpenPGP.
At a glance
K-9 Mail is available on Android — all free to download.
It is developed by K-9 Dog Walkers.
Screenshots
Frequently Asked Questions
- Is K-9 Mail free?
- Yes — K-9 Mail is free to download on Android.
- What platforms is K-9 Mail available on?
- K-9 Mail is available on Android.
- What is K-9 Mail?
- K-9 Mail is an open source email client that supports multiple accounts and works with basically every email provider. It offers features like unified inbox, automatic synchronization, push notifications, and OpenPGP encryption support.
- Does K-9 Mail support email encryption?
- Yes, K-9 Mail supports OpenPGP email encryption (PGP/MIME). To encrypt and decrypt emails, install the OpenKeychain app alongside K-9 Mail.
- Is K-9 Mail private and secure?
- K-9 Mail is privacy-friendly with no tracking whatsoever. It only connects to your email provider, and it's open source so the code is publicly available for review.
- Can I use K-9 Mail with multiple email accounts?
- Yes, K-9 Mail supports multiple accounts and includes a unified inbox feature to view all your emails in one place.
- What are the alternatives to K-9 Mail?
- K-9 Mail is similar to Proton Mail - Encrypted Email, Proton Authenticator, Mullvad VPN, and Thunderbird: Free Your Inbox. Browse related apps by tag: open source, email client, and encryption.
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