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Mailtrap Email Sandbox
What Mailtrap Email Sandbox is
Mailtrap Email Sandbox captures SMTP traffic from development and staging environments so teams can examine test messages without sending them to real recipients. Users can inspect message content and source, check spam scores, validate headers, and analyze HTML support across email clients. Separate sandboxes can serve different environments or review servers and be grouped into projects. The Sandbox API supports automated testing, with API calls listed as unlimited; the product works with applications and frameworks that support SMTP, and setup materials include 20+ code samples. Device Previews show how messages render in iOS Mail, Gmail, Outlook, and Apple Mail across mobile, desktop, and web. Teams can share sandboxes and selectively forward messages to whitelisted recipients. It is a testing tool, not a service for delivering email to real addresses. The Free plan includes 50 test emails per month and one sandbox. Basic is $17 a month, billed $168 billed annually ($14 /month); the listed starting price is $14/mo (annual).
Who it suits
Email Sandbox suits developers, QA teams, marketers, and managers who need to inspect or automate test-email workflows. It is not intended for delivering messages to real email addresses.
What it does well
- Inspects content, source, headers, and spam scores
- Supports automated testing through its API
- Offers previews across named email clients
- Works with SMTP-compatible apps and frameworks
- Free plan includes 50 test emails monthly
What to know first
- Free plan has one sandbox
- Free plan allows 50 test emails monthly
- Not designed to deliver email to real addresses
- Basic plan has no chat support
Limits
Free includes 50 test emails per month, one user, one sandbox, and 10 emails per sandbox; it has no sandbox email address. Basic includes 500 test emails per month, three users, one sandbox, and 50 emails per sandbox.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | 50 test emails/month · 1 user · 1 sandbox · 10 emails per sandbox · no sandbox email address | Free |
| Business | $1,188 billed annually ($99 /month) · 50,000 test emails/month · 50 users · 50 sandboxes · 2,000 forwarded emails/mo · no SSO | $123 a month |
| Basic | $168 billed annually ($14 /month) · 500 test emails/month · 3 users · 1 sandbox · 50 emails per sandbox · 100 forwarded emails/mo · no chat support | $17 a month |
| Team | $408 billed annually ($34 /month) · 5,000 test emails/month · 5 users · 5 sandboxes · 200 emails per sandbox · priority support | $42 a month |
| Enterprise | $4,788 billed annually ($399 /month) · Unlimited test emails · unlimited users · 300 sandboxes · SSO · priority support | $498 a month |
As mailtrap.io lists them, read 4 Oct 2026. The maker's own page has the final word.
Getting started
- Open https://mailtrap.io/email-sandbox/ in a web browser.
- Connect an application or framework that supports SMTP, using one of the 20+ code samples if useful.
- Create a sandbox for a development environment, staging environment, or review server.
- Group sandboxes into projects as needed.
- Use the Sandbox API to automate testing, or share sandboxes for team review.
- Choose a plan based on the number of test emails, users, and sandboxes needed.
Verdict
Mailtrap Email Sandbox focuses on inspecting and testing messages before delivery, with API automation and client previews. Check the plan limits and remember it does not send email to real recipients.
Questions
Is Mailtrap Email Sandbox free?
Yes. Free includes 50 test emails per month, one user, one sandbox, and 10 emails per sandbox.
How much do paid plans cost?
The pricing note lists paid plans from $14/mo (annual). Basic is $17 a month, billed $168 billed annually ($14 /month).
Can Email Sandbox send messages to real recipients?
No. Email Sandbox captures test traffic and is not designed to deliver email to real addresses.
Which email clients can Device Previews show?
Device Previews can render messages as they appear in iOS Mail, Gmail, Outlook, and Apple Mail across mobile, desktop, and web.
Can Email Sandbox be used with automated tests?
Yes. The Sandbox API supports automated testing, and API calls are listed as unlimited.
What integrations does Mailtrap list?
Mailtrap lists Salesforce Email Sandbox, Heroku, Supabase, Vercel, and SDKs for languages including Node.js, Python, PHP, Ruby, and Java.
Facts from Mailtrap Email Sandbox's own pages
- Account security
- The security page says Mailtrap enforces two-factor authentication for all users and supports TLS and HTTPS connections. · mailtrap.io, 4 Oct 2026
- API and automation
- The Sandbox API supports automated testing and the product page says API calls are unlimited. · mailtrap.io, 4 Oct 2026
- Company and history
- Mailtrap says it was built by Railsware engineers in 2011 after a staging system accidentally sent test emails to real customers. · mailtrap.io, 4 Oct 2026
- Compatibility previews
- Device Previews can render emails as they appear in iOS Mail, Gmail, Outlook, and Apple Mail across mobile, desktop, and web. · mailtrap.io, 4 Oct 2026
- Email analysis
- Users can inspect message content and source, check spam scores, validate headers, and analyze HTML support across email clients. · mailtrap.io, 4 Oct 2026
- Integration
- Email Sandbox works with apps or frameworks that support SMTP, and the setup page offers 20+ code samples. · mailtrap.io, 4 Oct 2026
- Integrations
- Mailtrap lists integrations including Salesforce Email Sandbox, Heroku, Supabase, Vercel, and SDKs for languages such as Node.js, Python, PHP, Ruby, and Java. · mailtrap.io, 4 Oct 2026
- Not for delivery
- Email Sandbox is a testing tool and is not designed to deliver emails to real email addresses. · mailtrap.io, 4 Oct 2026
- Plan limits
- The Free tier includes 50 test emails per month and one sandbox; Enterprise includes unlimited test emails and 300 sandboxes. · mailtrap.io, 4 Oct 2026
- Purpose
- Email Sandbox captures SMTP traffic from development and staging environments so teams can inspect test messages without delivering them to real recipients. · mailtrap.io, 4 Oct 2026
- Security
- Mailtrap states that it holds ISO/IEC 27001:2022 certification and complies with GDPR. · mailtrap.io, 4 Oct 2026
- Support
- The pricing page lists email support on Free, Basic, and Team, and email plus live chat on Business and Enterprise. · mailtrap.io, 4 Oct 2026
- Team use
- The maker describes developers, QA teams, marketers, and managers as users, with shared sandboxes and selected forwarding to whitelisted recipients. · mailtrap.io, 4 Oct 2026
- Testing workflow
- The product provides separate sandboxes for different environments or review servers and lets users group them into projects. · mailtrap.io, 4 Oct 2026
Where Mailtrap Email Sandbox stands on Freedom251
- Email Testing Software#13 of 28