MailCue
Open-source Docker email testing/production server with an MCP server for AI agents
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What is MailCue?
MailCue is Open-source Docker email testing/production server with an MCP server for AI agents It's designed for developers testing email flows or giving agents a mailbox.
About MailCue
Key Strengths
- Docker email server for realistic testing and production (Postfix, Dovecot, DKIM)
- MCP server lets AI agents read, send and triage mail
- MIT-licensed open source
Limitations to Consider
- Self-hosting means you own deliverability and security
- Small project (about 24 GitHub stars)
- The AI side is just an MCP interface
Best For
Developers testing email flows or giving agents a mailbox.
Skip it if: You want a hosted inbox.
Pricing
a completely free service with no subscription required
Free (MIT open source). (checked Oct 11, 2026)
Sources
- https://github.com/Olib-AI/mailcue
- https://olib-ai.github.io/mailcue/guides/mcp.html
- https://www.hunted.space/product/mailcue-realistic-email-testing-server
Pros, cons and pricing compiled from public sources (official pricing/docs pages, published reviews, user reports), not hands-on testing.
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What is MailCue?
MailCue is Open-source Docker email testing/production server with an MCP server for AI agents It's designed for developers testing email flows or giving agents a mailbox.
How much does MailCue cost?
MailCue offers a completely free service with no subscription required You can get started for free on their official website.
Who should use MailCue?
MailCue is best suited to developers testing email flows or giving agents a mailbox.