An email and SMTP testing tool with API for developers
The email sandbox only, with SMTP capture, a web inbox, HTML checks and an API; no sending service.
alternatives to
Mailtrap
Hosted email sandbox that captures mail sent from development and staging, alongside a sending service. A closed product from Railsware.
Side by side
| Tool | Fit | Stars | Licence | Terms | Self-hosted | Language | Latest | Last push |
|---|---|---|---|---|---|---|---|---|
| Mailpit | Partial | 11k | MIT | Open source | No | Go | v1.31.4 | 2026-10-06 |
| MailCatcher | Partial | 6.8k | MIT | Open source | No | Ruby | v0.10.0 | 2026-09-16 |
| smtp4dev | Partial | 4k | BSD-3-Clause | Open source | No | C# | 3.15.0 | 2026-10-05 |
| Inbucket | Partial | 2.3k | MIT | Open source | No | Go | v3.1.1 | 2026-10-06 |
Every alternative
4 alternatives
Catches mail and serves it through a dream.
A local SMTP server and web inbox for development; no API checks or sending service.
smtp4dev - the fake smtp email server for development and testing
The email sandbox only, with a web inbox, IMAP access and relay rules; no sending service.
- Language
- C#
- Licence
- BSD-3-Clause
- Stars
- 4k
- Latest
- 3.15.0
- Last push
- 2026-10-05
Disposable webmail server (similar to Mailinator) with built in SMTP, POP3, RESTful servers; no DB required.
The email sandbox only, with a web inbox, POP3 and a REST API; no sending service.
Head to head
About Mailtrap
- Vendor
- Railsware