SipherMailEncrypted email for privacy
End-to-end encrypted email with zero-knowledge architecture, optional AI assistance, custom domains, and plans for individuals and businesses. Operated by Trisun.
Secure email without the compromise
SipherMail combines enterprise-grade encryption with a modern inbox experience — including threaded conversations, keyboard shortcuts, and optional AI tools you control.
End-to-end encryption
SipherLock™ encryption keeps messages private. We cannot read your mailbox contents.
AI email assistant
Optional AI for compose, smart replies, summaries, and inbox organization — with plan-based limits.
Custom domains
Use your own domain on paid plans. Business plans support multiple domains and shared inboxes.
Cross-platform apps
Access SipherMail on the web, iOS, and Android with secure sync across devices.
Zero-knowledge architecture
Built so your private content stays yours — no advertising, no data mining of mailbox content.
Professional sending limits
Clear SMTP rate limits per plan so teams can send reliably without abusing the network.
Simple plans for people and teams
Transparent pricing. Upgrade or downgrade anytime. Web billing is processed securely via Stripe. See our Refund & Cancellation Policy.
For individuals
Free
Perfect for personal use
- 2 GB storage
- 1 email address
- Free AI tier (limited)
- End-to-end encryption
- Web, iOS & Android access
Personal Pro
Power user email with Pro AI
or $99.99/year
- 15 GB storage
- 5 email addresses
- 1 custom domain
- Full email history import
- Pro AI features
- Higher sending limits
For business
Business Starter
Team email for small businesses
or $60/user/year
- 10 GB storage per user
- 5 addresses per user
- Up to 3 custom domains
- Shared / team mailboxes
- Business AI tier
Business Pro
Advanced teams with full AI suite
or $120/user/year
- 25 GB storage per user
- 10 addresses per user
- Up to 10 custom domains
- Advanced admin controls
- Business Pro AI tier
Enterprise
Dedicated support & custom limits
- 50 GB+ storage per user
- Up to 50 addresses per user
- Up to 50 custom domains
- Enterprise AI limits
- Priority / dedicated support
Prices shown in USD. Taxes may apply based on your location. App Store and Google Play pricing may differ and is governed by Apple or Google refund policies.
Secure checkout
Card payments processed by Stripe.
Digital delivery
Instant account access after purchase — no shipping.
Cancel anytime
Manage subscriptions in-account or contact support.
14-day refund window
Eligible web purchases — see Refund Policy.
Billing FAQ
How does billing work?
Web subscriptions are billed monthly or annually in advance through Stripe. You can cancel anytime; access continues until the end of the paid period.
Do you offer refunds?
Yes. Eligible web purchases may be refunded within 14 days under our Refund & Cancellation Policy. Read the full policy
Are there free trials?
The Free plan is available without a credit card. You can upgrade to a paid plan when you need more storage, addresses, domains, or AI capacity.