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Implement or troubleshoot Cloudflare Email Sending and Email Routing integrations and their delivery configuration.
Passed 22 of 22 test cases with the skill, and 15 of 22 without it.
and 9 more in the full report
7 fixed15 passed either way0 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 7 test cases the skill fixed. Same model, same prompt, with and without the skill.
Before deploying my application, I want to verify which of my registered domains currently have outbound email sending enabled via the command line. What Wrangler command lists these domains?
| Checked | Without skill | With skill |
|---|---|---|
| Recommends running wrangler email sending list to inspect domain status. | Missed | Passed |
The instructions your model reads when the skill loads.
Your knowledge of the Cloudflare Email Service, Email Routing or Email Sending may be outdated. Prefer retrieval over pre-training for any Cloudflare Email Service task.
Cloudflare Email Service lets you send transactional emails and route incoming emails, all within the Cloudflare platform. Your knowledge of this product may be outdated — it launched in 2025 and is evolving rapidly. Prefer retrieval over pre-training for any Email Service task.
If there is any discrepancy between this skill and the sources below, always trust the original source. The Cloudflare docs, REST API spec, @cloudflare/workers-types, and Agents SDK repo are the source of truth. This skill is a convenience guide — it may lag behind the latest changes. When in doubt, retrieve from the sources below and use what they say.
| Source | How to retrieve | Use for |
|---|---|---|
| Cloudflare docs | Cloudflare MCP docs tool or URL https://developers.cloudflare.com/email-service/index.md | API reference, limits, pricing, latest features |
| REST API spec | https://developers.cloudflare.com/api/resources/email_sending/index.md | OpenAPI spec for the Email Sending REST API |
| Workers types | https://www.npmjs.com/package/@cloudflare/workers-types | Type signatures, binding shapes |
| Agents SDK docs | Email agent walkthrough | Email handling in Agents SDK |
Before writing any email code, verify the basics are in place:
npx wrangler email sending list to see which domains have email sending enabled. If the domain isn't listed, run npx wrangler email sending enable userdomain.com or see cli-and-mcp.md for full setup instructions.send_email in wrangler.jsonc (for Workers)npm ls postal-mime (only needed for receiving/parsing emails)Start here. Find your situation, then follow the link for full details.
| I want to... | Path | Reference |
|---|---|---|
| Send emails from a Cloudflare Worker | Workers binding (no API keys needed) | sending.md |
| Send emails from an AI agent built with Cloudflare Agents SDK | onEmail() + replyToEmail() in Agent class | sending.md |
| Send emails from an external app or agent (Node.js, Go, Python, etc.) | REST API with Bearer token | rest-api.md |
| Send emails from a coding agent (Claude Code, Cursor, Copilot, etc.) | MCP tools, wrangler CLI, or REST API | cli-and-mcp.md |
| Receive and process incoming emails (Email Routing) | Workers email() handler | routing.md |
| Set up Email Sending or Email Routing | wrangler email sending enable / wrangler email routing enable, or Dashboard | cli-and-mcp.md |
| Improve deliverability, avoid spam folders | Authentication, content, compliance | deliverability.md |
test cases passed, vs 15 / 22 without
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