MailCat
Email service for AI agents (open-source)
Details
- External ID
- 47101217
- Source
- HN
- Company
- —
- Product
- MailCat
- Website domain
- github.com
- Launched
- Feb. 21, 2026
- Cohort
- —
- Upvotes
- 9
- Upvotes percentile
- 0.4865229110512129
- Tags
- —
- Fetched at
- Sept. 7, 2026, 9:25 p.m.
- Updated at
- Sept. 7, 2026, 9:25 p.m.
Description
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.
Enrichment
- Theme
- AI email agents and deliverability
- Vertical
- Horizontal
- Function
- Communication
- Audience
- Developer
- AI stance
- AI feature
- Project type
- Hobby / open-source project
- Normalized one-liner
- email service for ai agents
- Manually corrected
- False
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 — 255 launches clear the similarity bar, closest 8 shown.
Attention rank: #143 of 256 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 106 days after the earliest competitor.
- Atomic Mail Agentic · ph · 2026-06-21 · 268 upvotes · similarity 0.63
- Agent.email · hn · 2026-05-21 · 99 upvotes · similarity 0.61
- 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
- dearagent · github · 2026-09-11 · 25 upvotes · similarity 0.54
- Cloudflare Email Service · ph · 2026-04-17 · 167 upvotes · similarity 0.51
- EPST · ph · 2026-09-17 · 1 upvotes · similarity 0.48
Other launches for this product
- No other launches for this product.