Replace / Mailtrap
Best free Mailtrap alternatives (open source, self-hosted) 2026
The best open-source alternative to Mailtrap is Mailpit, self-hosted on Railway. SMTP you catch. Mailpit is MIT — Mailtrap without the hosted inbox seat.
Estimated save $1,200 a year.
Open the stackStart on Railway
How Mailtrap compares
| Mailtrap | Mailpit | |
|---|---|---|
| Pricing model | Hosted subscription | Open-source or fair-code license; you pay the host |
| Hosting | Vendor cloud | Self-hosted on Railway or any VPS |
| Rough monthly cost | Public list price not verified this run | Hosting only — no SaaS seat meter in this repo |
- Mailpit
MIT SMTP catcher and web UI — the published Mailtrap path
FAQ
- What is the best free open-source Mailtrap alternative?
- The best open-source alternative to Mailtrap is Mailpit, self-hosted on Railway. SMTP you catch. Mailpit is MIT — Mailtrap without the hosted inbox seat.
- Is it free?
- The Mailpit licenses are open source or fair-code. You still pay hosting (Railway or any VPS) and any APIs the stack calls. There is no Mailtrap seat or task bill on this path.
- Can I migrate from Mailtrap?
- Yes. Start with the workflows or data you actually use, then cut over. The Mailpit stack page has the agent prompt and the cost table; most teams rebuild the slice that matters and leave old Mailtrap links until they expire.
- How do I deploy it?
- Open the Mailpit stack, copy the agent prompt, and deploy on Railway (one service, PORT, and a volume when the app needs disk). Placeholder: Mailpit (official image) plus a volume if you persist messages. Bind HTTP to 0.0.0.0:$PORT. SMTP on the documented port. No one-click template in this repo yet — Start on Railway. Production send stays on /stacks/plunk-newsletter.
- What does this replace?
- Mailtrap. The published small-team estimate on this stack is $1,200 a year.
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