Native Desktop & Mobile · Purpose-built for Zimbra Mail Server
The Native Client for Zimbra.
Fast. Secure. Offline-First.
Zee Mail replaces sluggish browser tabs and Electron bloat with a lean, compiled native client. Powered by a zero-panic Rust core, military-grade SQLCipher AES-256 storage, 100% offline full-text search, and zero-token credential isolation.
Enterprise Architecture
Engineered for institutional productivity & uncompromising security
Zee Mail is not a packaged website. It is an authentic native client engineered with strict zero-panic guarantees, OS keychain protection, and comprehensive protocol parity.
Native Rust Core
Instant startup and sub-10ms UI responsiveness. Consumes under 50 MB RAM with zero Electron bloat and a hardened, zero-panic runtime.
Zero-Token Isolation
Passwords and authentication tokens stay locked inside native OS keychains (Windows Credential Manager / macOS Keychain). Tokens never enter JavaScript.
100% Offline with Outbox
Search tens of thousands of messages offline with FTS5. Mails composed offline queue in the Outbox with exponential backoff and undo send.
Hierarchical Directory (HAB)
Browse full institutional hierarchy (Board → Departments → Units → Staff) and enjoy instant GAL auto-complete when composing.
Calendar & Room Booking
RFC 5545 iCalendar engine with complex RRULE/EXDATE support via chrono-tz. Book meeting rooms, projectors, and check Free/Busy schedules.
Zimbra 10 Parity & Mail Recall
Recall sent internal emails before recipients open them (ZCS 10.1+). Real-time multi-account push notifications via the WaitSet engine.
Self-Service 2FA & Recovery
Configure TOTP Authenticator 2FA directly within the app. Secure self-service account recovery via OTP verification codes.
Briefcase Drive & Data Sources
Integrated Briefcase document drive (Folder 16) with revision history and file locking. Aggregate external accounts via POP3 and IMAP.
S/MIME & App Lock
Native PKCS#7 / S/MIME cryptographic inspection. Screen lock protected by personal PIN (PBKDF2-SHA256 210,000 rounds) and remote session revocation.
Smart Reading Pane
Complex institutional HTML mail renders accurately
Government and enterprise reports often feature dense HTML: wide tables, newsletter layouts, and deep quotation threads. Zee Mail optimizes rendering without breaking formats.
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Wide Tables Never Clip
Institutional tables scale automatically and allow horizontal scrolling without shrinking surrounding text or cutting off column data.
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Smart Quote Collapsing
Cluttered reply chains from Zimbra, Outlook, and Gmail collapse cleanly. Redundant Word/Outlook formatting artifacts are automatically stripped.
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True-to-Author Colors in Dark Mode
Backgrounds adapt to dark theme while intentional diagram and chart colors remain vivid and untouched.
Licensing Tiers
Straightforward, transparent licensing
Choose the plan that fits your organization. Freeware covers all core needs; Zee Mail Plus provides advanced security and customization.
Zee Mail Freeware
Free forever for personal and institutional use. Complete Zimbra mail, calendar, and contacts.
- Full Mail, Calendar, Contacts, and Outbox
- 100% Offline-First with FTS5 search
- SQLCipher AES-256 local encryption
- Zero-Token security isolation
- Automatic update checks
- Default subtle footer signature
Zee Mail Plus
Enhanced privacy, security protection, and personalized branding for professionals and agencies.
- Everything in Freeware
- No promotional footer signatures
- App Lock with personal PIN (PBKDF2-SHA256)
- Auto-lock on idle & notification privacy
- Priority enterprise deployment assistance
- GPO-ready MSI deployment package
Downloads
Deploy Zee Mail to your devices
Native, hardened installers for desktop and mobile. Zero server-side plugins required.
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Frequently Asked Questions
How does Zee Mail compare to browser webmail?
Browser webmail consumes hundreds of megabytes up to 1 GB of RAM, fails completely without an internet connection, and frequently clips wide HTML tables. Zee Mail is built natively with Rust: it responds in sub-10ms, consumes under 50 MB RAM, operates 100% offline with instant FTS5 search, and isolates session tokens inside the OS keychain.
Do I need to install any plugin on my Zimbra server?
No extra server software or Zimlets are required. Zee Mail connects directly via standard Zimbra SOAP/JSON APIs over secure HTTPS. It is compatible with Zimbra 8.8, 9.0, 10.0 (Daffodil), and 10.1+.
How are my credentials and emails secured?
Local SQLite databases are encrypted using SQLCipher AES-256. Passwords and session tokens never enter JavaScript; they are stored exclusively in native OS credential vaults (Windows Credential Manager / macOS Keychain).
What happens if I lose internet connectivity?
All previously synchronized emails, contacts, and calendar events remain fully readable and searchable with FTS5. New emails, replies, and edits queue safely in the Outbox and automatically sync when reconnected.
What is the difference between Freeware and Plus?
The Freeware version is free forever with complete Mail, Calendar, Contacts, and Offline support. Zee Mail Plus adds PIN App Lock protection, removes promotional footer signatures, and includes enterprise mass-deployment support.
Upgrade your organisation's Zimbra email experience
Download the native, lightweight, and offline-ready client today.