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SPECIFICTION
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Mailtrap Email Sandbox

mailtrap.io

From $17/mo Free plan WebAPI
Visit mailtrap.io
Spec score 7.9 #15 of 28 in Email Testing Software

What it is

Mailtrap Email Sandbox captures SMTP traffic from development and staging environments so teams can inspect test messages without delivering them to real recipients. Users can review 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 can be grouped into projects. The Sandbox API supports automated testing, with API calls listed as unlimited. The tool works with applications and frameworks that support SMTP, and its setup page provides 20+ code samples. Device Previews render messages as they 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. The Free plan includes 50 test emails per month and one sandbox. Basic is $17 a month, billed $168 annually ($14/month); the listed paid starting price is $14/mo billed annually. Email Sandbox is for testing, not delivery to real addresses.

Spec sheet

Purpose
Email Sandbox captures SMTP traffic from development and staging environments so teams can inspect test messages without delivering them to real recipients.Read 4 Oct 2026 · mailtrap.io
Integrations
Mailtrap lists integrations including Salesforce Email Sandbox, Heroku, Supabase, Vercel, and SDKs for languages such as Node.js, Python, PHP, Ruby, and Java.Read 4 Oct 2026 · mailtrap.io
Security
Mailtrap states that it holds ISO/IEC 27001:2022 certification and complies with GDPR.Read 4 Oct 2026 · mailtrap.io
Support
The pricing page lists email support on Free, Basic, and Team, and email plus live chat on Business and Enterprise.Read 4 Oct 2026 · mailtrap.io
Account security
The security page says Mailtrap enforces two-factor authentication for all users and supports TLS and HTTPS connections.Read 4 Oct 2026 · mailtrap.io
API and automation
The Sandbox API supports automated testing and the product page says API calls are unlimited.Read 4 Oct 2026 · mailtrap.io
Company and history
Mailtrap says it was built by Railsware engineers in 2011 after a staging system accidentally sent test emails to real customers.Read 4 Oct 2026 · mailtrap.io
Compatibility previews
Device Previews can render emails as they appear in iOS Mail, Gmail, Outlook, and Apple Mail across mobile, desktop, and web.Read 4 Oct 2026 · mailtrap.io
Email analysis
Users can inspect message content and source, check spam scores, validate headers, and analyze HTML support across email clients.Read 4 Oct 2026 · mailtrap.io
Integration
Email Sandbox works with apps or frameworks that support SMTP, and the setup page offers 20+ code samples.Read 4 Oct 2026 · mailtrap.io
Not for delivery
Email Sandbox is a testing tool and is not designed to deliver emails to real email addresses.Read 4 Oct 2026 · mailtrap.io
Plan limits
The Free tier includes 50 test emails per month and one sandbox; Enterprise includes unlimited test emails and 300 sandboxes.Read 4 Oct 2026 · mailtrap.io
Team use
The maker describes developers, QA teams, marketers, and managers as users, with shared sandboxes and selected forwarding to whitelisted recipients.Read 4 Oct 2026 · mailtrap.io
Testing workflow
The product provides separate sandboxes for different environments or review servers and lets users group them into projects.Read 4 Oct 2026 · mailtrap.io

Plans and prices

Free Free 50 test emails/month · 1 user · 1 sandbox · 10 emails per sandbox · no sandbox email address Read 4 Oct 2026 · mailtrap.io
Basic $17 a month $168 billed annually ($14 /month) 500 test emails/month · 3 users · 1 sandbox · 50 emails per sandbox · 100 forwarded emails/mo · no chat support Read 4 Oct 2026 · mailtrap.io
Team $42 a month $408 billed annually ($34 /month) 5,000 test emails/month · 5 users · 5 sandboxes · 200 emails per sandbox · priority support Read 4 Oct 2026 · mailtrap.io
Business $123 a month $1,188 billed annually ($99 /month) 50,000 test emails/month · 50 users · 50 sandboxes · 2,000 forwarded emails/mo · no SSO Read 4 Oct 2026 · mailtrap.io
Enterprise $498 a month $4,788 billed annually ($399 /month) Unlimited test emails · unlimited users · 300 sandboxes · SSO · priority support Read 4 Oct 2026 · mailtrap.io

Every Mailtrap Email Sandbox plan and price →

Strong points and limits

Strong points

  • Inspects content, headers and spam scores
  • Automated testing through the Sandbox API
  • Works with SMTP-supporting apps and frameworks
  • Previews across mobile, desktop and web

Limits

  • Not designed to deliver real emails
  • Free tier allows 50 test emails monthly
  • Free tier includes one sandbox

Who it suits

It suits developers, QA teams, marketers and managers who need to inspect test emails before delivery. Teams can share sandboxes and selectively forward messages to whitelisted recipients.

Verdict

Email Sandbox provides a defined test workflow for inspecting messages, automating checks and previewing rendering across email clients. It does not send email to real recipients; the Free plan has a 50-message monthly limit.

Where Specifiction places it

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