Nmail

The reference Nostr Mail client, built with Flutter.

Where to get it

Platform	Where
Web	app.nostrmail.org
Android	ZapStore, or an APK from Releases
Linux	`.AppImage` or `.deb` from Releases
macOS	`.dmg` from Releases

Android ships in two flavors: the standard build, which may use Firebase for push, and a FOSS build with no Google dependency, which uses UnifiedPush instead. ZapStore distributes the FOSS build.

Features

Inbox, Sent, Archive and Trash, with stars, read state and custom folders
Rich text composing, attachments of any size, drag and drop
Send to Nostr recipients and to ordinary email addresses in the same message, choosing the transport per recipient
Scheduled sending
Contacts shared with any client that speaks the same address book
Multiple accounts, switched without logging out
Offline reading, with sends and uploads queued until you are back
Push notifications
Light and dark themes, following the system

Privacy in the app

Emails are gift wrapped end to end. Relays see a wrap addressed to a pubkey.
Folders, read state and stars are wrapped too, so the metadata does not leak.
Photos and videos lose their location, capture date and device details before they leave the app, at full quality.
Your key never leaves the device, and does not have to be on it at all: a signer app, a browser extension or a remote bunker can hold it instead.

Technology

Technology	Purpose
Flutter	Android, Linux, macOS and web from one codebase
GetX, go_router	State management and routing
ndk	Nostr protocol, relays, signers
nostr_mail	Email over Nostr
drift, SQLite	Local mailbox with full-text search
Blossom	Large emails and attachments

The repository is a Flutter workspace: packages/nmail_core holds the product code, apps/nmail_standard and apps/nmail_foss are the two thin app wrappers.