ZTmail.AI

Make Encryption and Intelligence the Default for Email Communication

Certificate Automation
No need to understand certificates, apply manually, or configure them.
Cryptographic Technology
Automatic signing, encryption, decryption, and signature verification.
Two Paths
One-click with the App; deploy the Gateway while continuing to use your existing email infrastructure, including familiar email clients.
Free Download ZTmail App Explore ZTmail Gateway

S/MIME Has Reached Its Moment
S/MIME has been a proven email encryption standard for decades.

The Standard Is Ready

In 2025, RFC 8823 — ACME for S/MIME was incorporated into the CA/Browser Forum S/MIME Baseline Requirements, providing an open standards foundation for S/MIME certificate automation.

Automation Has Already Proven Its Power

SSL/TLS certificate automation dramatically lowered the barrier to HTTPS deployment and helped drive encryption across the Internet. S/MIME needs the same transformation.

The Email Security Threat Is Evolving

AI is making BEC attacks more scalable, more convincing, and harder to detect with traditional security controls. Trusted email identity, digital signatures, and end-to-end encryption matter more than ever.

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AI Can Help. It Cannot Prove Identity
AI enhances the content layer. Cryptography protects the trust layer.

AI, Understand & Analyze

Draft Summarize Translate Detect
AI helps you work with the message.
+

Cryptography, Identity & Protect

Sign Encrypt Validate Protect
Cryptography helps you trust the sender.

AI for Productivity. Cryptography for Trust. The missing layer is not more intelligence. It is trust.

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S/MIME Is Not New
The Real Problem Is That It Has Always Been Too Hard to Use.

Too Hard for People

Certificates Private Keys Configuration Signing Encryption Decryption Renewal Backup/Restore

Too Hard for Organizations

Identity Validation Certificate Request Certificate Deployment Key Management Lifecycle Management

Existing Solutions Haven't Truly Solved the Usability Problem

The technology exists. The standards exist.
The solutions exist.
But a truly simple, automatic, end-to-end S/MIME experience is still missing.

Encryption Can Create a Security Blind Spot

Inbound: If an encrypted email cannot be decrypted, security inspection fails and the email is delivered directly.
Outbound: If an encrypted email cannot be inspected, security inspection fails and the email is sent directly.

The Problem is not S/MIME. The Problem is Usability.

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CAs Issue the Certificates, Email Clients Use Them.
But Who Makes It Actually Work?
The traditional S/MIME ecosystem has two separate sides; the end user needs to get support from both sides.

CA

Identity Validation

↓

Certificate Issuance
Application Gap

CAs don't build the email application layer.

?

Email clients don't operate the certificate lifecycle management.

Email Client

Certificate Usage

↓

Signing ▪ Encryption ▪ Decryption

Why ZTmail?
We Understand Both Sides: CA, Email Client.

20 Years
of CA Operations

Experience
CA Operations
Identity Validation
Certificates
Trust Infrastructure

ZTmail Connecting

CA / Cloud
Email Client + Gateway

5 Years
of Cryptographic Application Automation

ZT Browser UI for Website Identity
HTTPS Automation Gateway
Client + Cloud Integration
Encryption for Everybody AI, Your Key Identity Made Visible Key Management

Two Ways to Automate Email Encryption

ZTmail App

S/MIME Encryption for Everybody, Automated. AI, Your Key.
For individuals and small teams.
No certificate expertise required
No manual configuration
Automatic signing, encryption, decryption, and verification
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ZTmail Gateway

With Built-in Cryptographic Infrastructure for enterprise S/MIME Automation
For organizations and enterprises.
Self-sufficient certificate automation management
Automatic signing, encryption, decryption, and verification
Continue using your existing email infrastructure, including familiar email clients
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ZTmail S/MIME Automation Architecture
Client + Cloud — Making S/MIME Truly Automatic

The Hardware Gateway That Makes S/MIME Scalable
Enterprise-Scale S/MIME Automation. Built-In CA. Built-In HSM.

One Gateway. One Organizational Trust Infrastructure. Thousands to Millions of Mailboxes.
The Gateway automates the complete certificate lifecycle:
Request → Issue → Deploy → Renew → Replace → Revoke
With ZTmail Trust for organization-scale deployment and Global Trust where external Public CA trust is required, ZTmail turns S/MIME from a per-mailbox management problem into enterprise cryptographic infrastructure.

Instead of managing S/MIME certificates mailbox by mailbox, organizations deploy a dedicated cryptographic gateway with a built-in Enterprise CA, organizational SubCA, and HSM-protected SubCA private key, making S/MIME practical at enterprise scale.
ZTmail Gateway Changes the Deployment Model, Making S/MIME ACME From Standard to Infrastructure.

Don't Replace. Complete. Let Each System Do What It Does Best.
ZTmail Works with the Existing Email Security Infrastructure.

ZTmail adds the cryptographic application layer without replacing the email security systems already used. All employees still use their usual email clients, but now emails are automatically encrypted during transmission and storage.
Inbound
Decrypted by ZTmail Gateway
→ Security Inspection → Deliver
Outbound
Security Inspection → Signed & Encrypted by ZTmail Gateway → Send
Works with existing email security infrastructure.
Add S/MIME Automation. Keep Your Existing Security Infrastructure.

One Email. Two Trust Domains.
Three Service Editions. Four Trust Levels.

ZTmail Trust

Identity validated directly by ZTmail and certificate trusted within the internal ZTmail ecosystem.

Global Trust

Identity validated by public CAs with certificates natively trusted across all compatible global email clients.

Three Service Editions

Free Edition

ZTmail Trust
Mailbox Validated (MV)

Trusted Identity Edition

ZTmail Trust
Individual / Organization / Sponsor Validated

Global Ecosystem Edition

Global Trust
Mailbox / Individual / Organization / Sponsor Validated

Four Trust Levels

T1

Mailbox Validated (MV)
you control this mailbox.

T2

Individual Validated (IV)
you are this person.

T3

Organization Validated (OV)
you are associated with this organization.

T4

Sponsor Validated (SV)
you are this person and you belong to this organization.

Make Identity Visible. Make Identity Actionable.

ZTmail makes encrypted email trusted, visible, actionable, and automatic for everyone.
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Automate the Complete Email Cryptographic Lifecycle
From identity, keys, and certificates to every encrypted message.

Identity
Certificate
Sign
Validation
Encrypt
Decrypt
Key Management
Renew
Replace

From Enrollment to Every Encrypted Message. Automatically.

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Make S/MIME Automatic
S/MIME already provides the cryptographic foundation.

ZTmail automates everything around it. Certificates. Keys. Encryption. Signatures. Identity. For Everybody. For Every Organization.
Download ZTmail App Free Explore ZTmail Gateway