🔐
End-to-End Encrypted Email
Send and receive sensitive business email with encryption-first mailbox architecture.
- ✓ Private inboxes and aliases
- ✓ Secure message storage
- ✓ Verified sender workflows
Encrypted email + SMTP testing in one secure workspace
Encrypted email with privacy, proof, and deliverability.
Truinbox combines end-to-end encrypted email delivery with a Mailtrap-style SMTP sandbox for testing, debugging, and validating transactional emails before they reach real users.
E2EE mailbox security
SMTP sandbox testing
Zero-trust email flows
Your secure email stack
Secure communication and email testing under one roof.
Truinbox is designed for founders, developers, security teams, and regulated businesses that need confidential email plus a controlled SMTP testing environment.
✉️
SMTP Sandbox Testing
Capture application emails before they hit real customers, in a secure sandbox.
- ✓ Test transactional email
- ✓ Preview HTML and plain text
- ✓ Inspect headers and payloads
🛡️
Email Security Intelligence
Detect malware links, spoofing attempts, suspicious headers or attachments.
- ✓ Link and domain scanning
- ✓ SPF, DKIM, DMARC visibility
- ✓ Security audit trail
How it works
Route emails safely before they ever touch production.
Developers get isolated inboxes, SMTP credentials, message previews, and debugging tools.
Security teams get visibility into where email is going, what it contains, and whether it is safe.
1
Create a sandbox
Generate isolated SMTP credentials for each app, environment, or developer.
2
Route test email
Point staging, QA, or local development SMTP settings to Truinbox.
3
Inspect and debug
Review HTML, plain text, attachments, headers, links, spam signals, and metadata.
4
Promote with confidence
Move validated templates and flows into production after security and rendering checks.
SMTP Configuration
Encrypted Sandbox
Host: smtp.truinbox.dev
Port: 2525 / 587 / 465
Username: sandbox_8f32a
Password: ••••••••••••••
Message ID: msg_91c7f2
From: billing@app.local
To: customer@example.com
Status: captured, encrypted, not delivered
Security posture
A fully encrypted sandbox for email testing, compliance, and data security.
Truinbox lets you capture emails without exposing sensitive customer data or accidentally sending staging emails to real users. Messages are stored in an encrypted sandbox with audit trail, compliance, data deletion and RBAC.
Encrypted by design
Test emails often contain names, reset links, invoices, account details, or support content. Truinbox helps protect that data by keeping captured messages inside an encrypted environment instead of scattering them across developer inboxes or shared test accounts.
Compliance-friendly controls
Centralized access, audit logs, retention controls, and sandbox-level permissions make it easier to support internal security reviews, vendor assessments, SOC 2 readiness, HIPAA-adjacent workflows, fintech controls, and customer due diligence.
Production-safe delivery testing
Developers can test password resets, onboarding flows, billing notifications, claims emails, security alerts, and transactional templates without the risk of sending unfinished or sensitive messages to actual customers.
0
Real recipients touched during sandbox testing
E2EE
Encrypted mailbox foundation for sensitive communication
Audit
Reviewable logs for access, testing, and message inspection
Get early access
Bring secure email and SMTP testing into one workflow.
Tell us what you need to secure: encrypted business email, SMTP sandbox testing, transactional email QA, or all of the above.
- ✓ Encrypted email walkthrough
- ✓ SMTP sandbox setup & testing
- ✓ Security and compliance readiness