ClankerMails

ClankerMails gives workflows, scripts, and bots real email addresses that behave like APIs. Built by Lambda Symbolics OÜ, it lets developers create inboxes instantly over a REST API, receive signed webhooks when mail arrives, and read fully parsed JSON messages — without touching SMTP, IMAP, or email server configuration.

What It Is

ClankerMails is a programmable inbound email service designed for developers and AI agents. Instead of wiring up a mail server or fighting Gmail API quotas, you POST to an endpoint, get a live email address (e.g. mybot@clankermails.com), and immediately start receiving mail as structured JSON. The service handles domains, DNS, DKIM, SPF, and DMARC so you don't have to.

How the API Works

Every inbox is created and managed through a REST API authenticated with a Bearer token. Key endpoints include:

• POST /v1/inboxes — create an inbox with a chosen local part and optional webhook URL
• GET /v1/inboxes/{id}/messages — poll for messages with cursor-based pagination and unread_only filtering
• GET /v1/messages/{id} — retrieve a full message including from, to, subject, text, html, headers, and attachments
• PATCH /v1/inboxes/{id} — update webhook URL or inbox status
• GET /v1/attachments/{id} — download attachments directly

Webhooks are signed with HMAC-SHA256 and verified via the X-ClankerMails-Signature header, with exponential backoff retries on failure. The API rate limit is 60 requests per minute per API key.

AI Agent and MCP Integration

ClankerMails includes a hosted MCP (Model Context Protocol) server at https://clankermails.com/mcp. Claude Desktop users can add it via claude_desktop_config.json with no local install — just a URL and an API key. The docs note compatibility with ChatGPT, Claude, OpenClaw, and any other MCP-compatible client. This makes it straightforward to give an AI agent its own persistent email address that it can manage autonomously within a chat session.

What Developers Wire Up

The service is designed for a range of inbound email automation use cases:

• Automations and integrations — turn inbound mail into events for Zapier, Make, n8n, or custom servers
• Alerts and monitoring — route GitHub, Stripe, or Sentry alerts to a handler that acts on them
• Parsing and data capture — extract fields from invoices, receipts, and confirmations into a database
• AI agents and bots — give Claude, ChatGPT, or OpenClaw a dedicated address
• Forwarding and filtering — forward to a real inbox with per-sender allow/block lists
• Digests and newsletters — aggregate newsletters into a daily digest

Setup Path

Sign up with Google or email, create an inbox from the dashboard or API, then point code at the REST endpoint or configure a webhook. The docs include a ready-to-paste instruction block for AI bots, letting an agent handle the entire setup autonomously. No SMTP credentials, OAuth token refreshes, or MIME parsing libraries are needed on the developer's side.