Mailpit vs MailSlurp
Mailpit
mailpit.axllent.org
MailSlurp
mailslurp.comSide by side
| Figure | Mailpit | MailSlurp |
|---|---|---|
| Price from | Free | $19.99/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 1 | 9 |
| Spec score · Email Testing Software | 8.6 (#6) | 8.9 (#5) |
| Automation | Mailpit provides a REST API for accessing, searching, deleting, sending, tagging, and releasing messages. | Webhooks, filtering rules, forwarding, automatic replies and attachment automations route and process messages. |
| Integrations | The project says Mailpit is used by projects including Laravel, DDEV, Quarkus, and Saleor, and in CI/CD pipelines. | The integrations directory lists 79 items, including SDKs, Playwright, Cypress, Selenium, BrowserStack, Zapier, Power Automate, UiPath, Postman, GraphQL and webhooks. |
| Security | The web UI supports optional HTTPS and basic authentication, while SMTP can be configured with authentication and TLS. | The security policy says data at rest is encrypted with AES-256, data in transit uses TLS/SSL, and daily backups are stored in AWS S3. |
| Security controls | The web UI and API can use HTTPS and basic authentication, while SMTP supports optional STARTTLS or SSL/TLS and authentication. | The security policy states TLS in transit, AES-256 encryption at rest, AWS RDS/S3 storage, daily backups, VPNs, network ACLs, penetration testing and RBAC. |
| Support | The troubleshooting guide invites users to raise an issue after checking existing issues first. | The support page offers guides and direct contact for account, billing, delivery, and technical issues. |
Plans
MailSlurp
- FreeFree
- FreeFree
- Starter$19.99 a month
- Starter$19.99 a month
- Pro$49.99 a month
- Pro$49.99 a month
- Growth$129.99 a month
- Growth$129.99 a month
- EnterprisePriced on request
In their own words
Mailpit
Mailpit is a free, open-source tool for checking email content and SMTP delivery without sending messages to real addresses. It runs a local SMTP server alongside a web interface and REST API, and is available for Linux, macOS, Windows, Docker, and self-hosted deployment. The interface displays formatted HTML, source, text, headers, raw messages, and MIME attachments with image thumbnails. Checks include HTML and link testing, message screenshots, and optional SpamAssassin scoring. The API can access, search, send, delete, tag, and release messages; messages can also be relayed, forwarded, or used to trigger configurable SMTP errors. Mailpit can send message-summary webhooks and offers a Cypress package for integration tests. The web UI and API can use HTTPS and basic authentication; SMTP supports optional authentication and TLS. By default, SMTP listens on port 1025 without encryption or authentication. Mailpit keeps the most recent 500 messages by default.
MailSlurp
MailSlurp provides tools to build, test, and automate email and SMS workflows. Users can create temporary or permanent inboxes and handle messages through APIs, SDKs, SMTP, IMAP, and webhooks. It supports end-to-end tests for scenarios including OTP, MFA, magic links, and load testing, as well as device previews, email audits, and inbox placement checks. Pipelines can route messages and attachments using webhooks, forwarding, and automatic replies. AI extraction can turn emails and attachments such as PDFs and images into structured JSON using prompts, schemas, and OCR. Listed integrations include Playwright, Cypress, Selenium, HubSpot, Braze, Mailchimp, Zapier, and AI assistants through MCP. A REST API and official SDKs cover several programming languages. The free plan has capped allowances, including 500 received emails and 1,000 sandbox sends per month. Starter costs $19.99/mo; custom domains and phone numbers require Pro on Free and Starter plans. MailSlurp is web- and API-accessible.