MailCat
Email service for AI agents (open-source)
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Hi HN,I built MailCat because my AI agents kept getting stuck at "please verify your email."The key insight: if your AI agent can read documentation, it can set itself up.Just paste this into Claude Code, OpenClaw, or any AI agent: "Read https://mailcat.ai/skill.md and set up a MailCat mailbox for yourself. Save the token securely." That's it. Your agent reads the skill.md, creates a mailbox via API, and handles email verification autonomously from there.What it does: - Instant mailbox creation via API - Verification codes auto-extracted from emails - 1-hour retention (perfect for verification flows) - Fully open source (MIT) and self-hostableBuilt with Cloudflare Workers + D1 + KV. Self-host in ~10 minutes.GitHub: https://github.com/apidog/mailcatHappy to answer questions about the architecture.
HN · launched Feb 21, 2026 · 9 upvotes (top 51%) · 0 views
Niche: ai and productivity email clients · 126 launches, 8 in the last 7 days ▼ -43% · Explore this niche →
Category and tags
- Horizontal
- Communication
- Developer
- AI-native
- Commercial product
Visit website ↗ Source listing ↗
More like this: all 126 launches in ai and productivity email clients →
Could you build this?
Yes It wraps standard inbound email webhooks (e.g., via Cloudflare Email Workers, SendGrid, or Postmark) into a clean REST API and Markdown prompt skill for AI agents.
Discussion
No comments on this launch.
Competitors
Other products that read as similar to this one : 664 launches clear the similarity bar, closest 8 shown.
Attention rank: #329 of 665 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 110 days after the earliest competitor.
- OpenMail · ph · 2026-11-04 · 203 upvotes · similarity 0.66
- Atomic Mail Agentic · ph · 2026-06-21 · 268 upvotes · similarity 0.64
- Agent.email · hn · 2026-05-21 · 99 upvotes · similarity 0.62
- Agentboxd · ph · 2026-09-29 · 1 upvotes · similarity 0.60
- AgentMailr · hn · 2026-03-15 · 7 upvotes · similarity 0.59
- AgentMail · ph · 2026-04-09 · 274 upvotes · similarity 0.59
- MailCat - for gmail power users · ph · 2026-10-04 · 1 upvotes · similarity 0.56
- dearagent · github · 2026-09-11 · 25 upvotes · similarity 0.55
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