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MailDev
Free, open-source local SMTP server and web inbox that catches every email your app sends in development.
Day 43 since launch · Launched 25 August 2026
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Made by Shushant LakhyaniKnow about Shushant Lakhyani hereGet all my visual guides hereSee what I can build for youAI+Tech+No-Code+Online Business Mini GuidesJoin the newsletterBuilt with love by Shushant Lakhyani. Building bestproductivityresources.com
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What is MailDev?
MailDev is a free, open-source local SMTP server with a web inbox that catches every email your application sends during development, so you can test sign-up, reset and notification emails without touching a real mail server. It also ships with a built-in MCP server, letting AI agents like Claude, Cursor and Codex read your dev inbox and verify emails programmatically.
Pros
- Catches all outgoing dev email in one local inbox
- Built-in MCP server so AI agents can read and verify emails
- Free and open source
Cons
- Local/dev use only — not a production email service
- Requires running a local server alongside your app
Who should use MailDev
Developers testing transactional email locally, especially those letting AI agents verify emails end to end.
Who may not need it
Non-technical users or teams looking for a hosted email delivery service.
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