Getting Started
defnd.email uses end-to-end encryption. Your private key never leaves your device. We cannot read your data — by design.
After registration, your browser generates a keypair. The public key is stored on our servers. The private key stays with you.
1. Create account
Sign up at defnd.email/auth/register. Choose your username — this becomes your email address.
2. Save recovery phrase
You'll get a 24-word recovery phrase. Store it safely — it's the only way to recover access if you forget your password.
3. Start using
Access Mail, Calendar, Notes, and Passwords — all encrypted with your keys.
E2E encrypted email with @defnd.email address.
- Web client only (encryption requires browser)
- Send encrypted messages to external recipients
- Receive and decrypt incoming mail
- Attachments encrypted client-side
Calendar
Encrypted calendar with events, reminders, and categories.
- All event data encrypted client-side
- Recurring events support
- Categories with colors
- Offline support
Notes
Secure notes with folders and tags.
- Note content encrypted before storage
- Organize with folders and tags
- Pin important notes
- Offline editing
Passwords
Zero-knowledge password vault.
- All credentials encrypted locally
- Password generator
- Import from other managers (CSV)
- Organize with folders
Security
Security features to protect your account.
Two-Factor Auth
Enable two-factor authentication in Settings. We support TOTP apps (Google Authenticator, Authy, etc.).
Encryption
- Key exchange: X25519 (Curve25519)
- Encryption: XChaCha20-Poly1305
- Key derivation: Argon2id
- Recovery: BIP39 (24 words)
API
Send encrypted emails via REST API (Pro plan).