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Mailtrap Email Sandbox
What it is
Mailtrap Email Sandbox captures SMTP traffic from development and staging environments so teams can examine test messages without delivering them to real recipients. Users can inspect message content and source, check spam scores, validate headers, and review HTML rendering across email clients. Separate sandboxes can be created for different environments or review servers and grouped into projects. The Sandbox API supports automated testing, and API calls are listed as unlimited. The service works with applications and frameworks that support SMTP, with more than 20 code samples on its setup page. Device Previews show how messages appear in iOS Mail, Gmail, Outlook, and Apple Mail across mobile, desktop, and web. Teams can share sandboxes and selectively forward messages to whitelisted recipients. This is a testing tool, not a service for sending email to real addresses. The Free plan includes 50 test emails per month and one sandbox; the pricing note lists paid plans from $14/mo billed annually. Mailtrap states that it holds ISO/IEC 27001:2022 certification and complies with GDPR.
For and against
For
- Inspects content, source, headers, spam scores, and HTML.
- Separate sandboxes can be grouped into projects.
- Sandbox API supports automated testing with unlimited calls.
- Device Previews cover mobile, desktop, and web.
Against
- It is not designed to deliver email to real addresses.
- Free includes 50 test emails per month.
- Free includes one sandbox.
The verdict
Mailtrap Email Sandbox is for catching and reviewing test messages in development and staging, not for sending real campaigns. Its free tier is limited to 50 monthly test emails and one sandbox.
Who it suits
It suits developers, QA teams, marketers, and managers who need to review test email before delivery. Teams can share sandboxes and selectively forward messages to whitelisted recipients.
Plans and prices
Free
50 test emails/month · 1 user · 1 sandbox · 10 emails per sandbox
Read 4 Oct 2026 · mailtrap.io
Basic
500 test emails/month · 3 users · 1 sandbox · 50 emails per sandbox
Read 4 Oct 2026 · mailtrap.io
Team
5,000 test emails/month · 5 users · 5 sandboxes · 200 emails per sandbox
Read 4 Oct 2026 · mailtrap.io
Business
50,000 test emails/month · 50 users · 50 sandboxes · 2,000 forwarded emails/mo
Read 4 Oct 2026 · mailtrap.io
Enterprise
Unlimited test emails · unlimited users · 300 sandboxes · SSO
Read 4 Oct 2026 · mailtrap.io
On the record
- Account security
- The security page says Mailtrap enforces two-factor authentication for all users and supports TLS and HTTPS connections.mailtrap.io · read 4 Oct 2026
- API and automation
- The Sandbox API supports automated testing and the product page says API calls are unlimited.mailtrap.io · read 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 · read 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 · read 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 · read 4 Oct 2026
- Integration
- Email Sandbox works with apps or frameworks that support SMTP, and the setup page offers 20+ code samples.mailtrap.io · read 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 · read 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 · read 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 · read 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 · read 4 Oct 2026
- Security
- Mailtrap states that it holds ISO/IEC 27001:2022 certification and complies with GDPR.mailtrap.io · read 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 · read 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 · read 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 · read 4 Oct 2026
