Side by side
Mailpit vs Mailtrap Email Sandbox
Both stand on email testing software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan APILinuxMac+3
Mailpit combines local SMTP delivery, message inspection, and automated testing tools in a free package. Configure SMTP security as needed and account for its default message retention and POP3 limits.
Visit Mailpit
Free plan APIWeb
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.
Visit Mailtrap Email SandboxThe facts
| Mailpit | Mailtrap Email Sandbox | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | API, Linux, Mac, Self-hosted, Web, Windows | API, Web |
| Lowest paid plan | Free or on request | Basic: $17 a month |
| Plans published | 1 | 5 |
| Maker | Not published | Not published |
| Website | mailpit.axllent.org | mailtrap.io |
| On email testing software | #9 of 28 | #13 of 28 |
Mailpit: what it does well
- Inspects HTML, source, headers, and MIME attachments.
- Includes HTML compatibility and link checks.
- REST API supports integration testing and message management.
- Can trigger configurable SMTP errors.
- Static binaries and Docker images are available.
What to know first
- Default SMTP has no encryption or authentication.
- Default retention keeps only the latest 500 messages.
- Optional POP3 exposes only the latest 100 messages.
- The UI permits tracking images.
Mailtrap Email Sandbox: 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
Alternatives to Mailpit Alternatives to Mailtrap Email Sandbox The whole list