Sterna Mail icon
Sterna Mail icon

Sterna Mail

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Android email app focused on privacy and security, supporting JMAP, IMAP, and SMTP protocols, encrypted credentials, OpenPGP through OpenKeychain, unified inbox, conversation threading, offline mode, strong tracking protection, F-Droid distribution, no ads or Google dependence.

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  • Since 2026

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  • Android
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Sterna Mail was added to AlternativeTo by emon_codeberg on and this page was last updated .

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What is Sterna Mail?

Sterna Mail is a private, native Android email client built for JMAP, the faster successor to IMAP, with full support for classic IMAP/SMTP too. You pick the protocol when you add an account, so it works with JMAP servers like Stalwart as well as any standard mail provider.

It needs no Google services at all: push notifications arrive over JMAP EventSource, IMAP IDLE or UnifiedPush rather than Firebase. Remote images and tracking pixels are blocked by default, credentials are encrypted with the Android KeyStore, and OpenPGP is supported through OpenKeychain on both JMAP and IMAP/SMTP.

Other features include a unified inbox across multiple accounts, shared and delegated mailboxes, conversation threading, offline access through a local cache, search with filters, multiple identities with their own signatures, undo send, schedule send, snooze, a server-side vacation responder and Sieve filter rules.

It is free software under the GPLv3, distributed on F-Droid with reproducible builds, and available in nine languages.