Resend llms.txt

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Resend is the email API for developers. Send transactional and marketing emails at scale with a simple, modern API.

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llms.txt · 149 lines
  1. # Resend
  3. > Resend is the email API for developers. Send transactional and marketing emails at scale with a simple, modern API.
  5. For AI agents and automation, use the tools below.
  7. ## When to use Resend
  9. Reach for Resend when a task involves sending, receiving, or managing email programmatically:
  11. - Send transactional email (welcome emails, password resets, receipts, notifications) via `POST https://api.resend.com/emails` with an API key, or through an official SDK.
  12. - Send batch email (up to 100 messages per request) via `POST https://api.resend.com/emails/batch`.
  13. - Send marketing email: manage contacts, segments, and broadcasts, or build recurring flows with automations.
  14. - Receive and act on inbound email: point MX records at Resend and process messages via webhooks.
  15. - Build email templates with React using [React Email](https://react.email), then send them through the API.
  16. - Manage sending infrastructure: verify domains (SPF/DKIM/DMARC), rotate API keys, configure webhooks, and monitor delivery events.
  18. How to call Resend: authenticate with a `Bearer` API key against `https://api.resend.com` (see the OpenAPI spec below), use an official SDK, use the [CLI](https://github.com/resend/resend-cli), or connect to the [MCP server](https://mcp.resend.com/mcp). Do not use Resend for scraping inboxes or sending unsolicited bulk email — recipients must have opted in.
  20. ## Command line tool
  22. Install and use the Resend CLI from the terminal.
  24. - [Install](https://resend.com/install.sh)
  25. - [Repository](https://github.com/resend/resend-cli)
  27. ## MCP Server
  29. Add Resend to Cursor, Claude, and other MCP clients.
  31. - [Remote MCP Server](https://mcp.resend.com/mcp)
  32. - [Self-hosted MCP Server](https://github.com/resend/resend-mcp)
  33. - [MCP Discovery](https://resend.com/.well-known/mcp.json)
  35. ## Skills
  37. Best practices for building and sending emails with agents.
  39. - [Skills Discovery](https://resend.com/.well-known/agent-skills/index.json)
  40. - [Resend](https://raw.githubusercontent.com/resend/resend-skills/refs/heads/main/skills/resend/SKILL.md)
  41. - [React Email](https://raw.githubusercontent.com/resend/resend-skills/refs/heads/main/skills/react-email/SKILL.md)
  42. - [Email Best Practices](https://raw.githubusercontent.com/resend/resend-skills/refs/heads/main/skills/email-best-practices/SKILL.md)
  43. - [Resend CLI](https://raw.githubusercontent.com/resend/resend-skills/refs/heads/main/skills/resend-cli/SKILL.md)
  44. - [Agent Email Inbox](https://raw.githubusercontent.com/resend/resend-skills/refs/heads/main/skills/agent-email-inbox/SKILL.md)
  46. ## Documentation
  48. The llms.txt file containing all Resend documentation.
  50. - [Full documentation](https://resend.com/docs/llms.txt)
  52. ## Support
  54. How to get help from the Resend support team, and how to write a request that gets resolved on the first reply. Agents contacting support on a user's behalf should read the agent guide first — there is no Support API; diagnose, draft, and have the user submit.
  56. - [Support (llms.txt)](https://resend.com/support/llms.txt)
  57. - [Support guide for agents](https://resend.com/support/agent.md)
  58. - [Support (HTML)](https://resend.com/support)
  60. ## OpenAPI spec
  62. The full OpenAPI 3.0 specification for the Resend API.
  64. - [OpenAPI spec (YAML)](https://resend.com/openapi.yaml)
  65. - [OpenAPI spec (JSON)](https://resend.com/openapi.json)
  67. ## Pricing
  69. Plans, features, and cost-per-email for transactional and marketing emails.
  71. - [Pricing (Markdown)](https://resend.com/pricing.md)
  72. - [Pricing (HTML)](https://resend.com/pricing)
  74. ## Enterprise
  76. Enterprise plans, SLAs, security and compliance, and how to contact sales.
  78. - [Enterprise (Markdown)](https://resend.com/enterprise.md)
  79. - [Enterprise (HTML)](https://resend.com/enterprise)
  81. ## Blog
  83. Articles on email infrastructure, developer experience, and product updates. The index enumerates every post as a flat list of links. Append `.md` to any post URL, or send `Accept: text/markdown`, to receive the raw markdown source.
  85. - [Blog index (Markdown)](https://resend.com/blog.md)
  86. - [Blog index (HTML)](https://resend.com/blog)
  87. - Example: [https://resend.com/blog/agent-experience.md](https://resend.com/blog/agent-experience.md)
  89. ## Changelog
  91. Resend product updates and changes. The index enumerates every entry as a flat list of links. Append `.md` to any entry URL, or send `Accept: text/markdown`, to receive the raw markdown source.
  93. - [Changelog index (Markdown)](https://resend.com/changelog.md)
  94. - [Changelog index (HTML)](https://resend.com/changelog)
  95. - Example: [https://resend.com/changelog/adding-support-for-nextjs-14.md](https://resend.com/changelog/adding-support-for-nextjs-14.md)
  97. ## Handbook
  99. The process behind Resend — engineering, design, marketing, people, and company values. The index enumerates every handbook entry as a flat list of links. Append `.md` to any handbook URL, or send `Accept: text/markdown`, to receive the raw markdown source.
  101. - [Handbook index (Markdown)](https://resend.com/handbook.md)
  102. - [Handbook index (HTML)](https://resend.com/handbook)
  103. - Example: [https://resend.com/handbook/engineering/how-we-approach-ci-cd.md](https://resend.com/handbook/engineering/how-we-approach-ci-cd.md)
  105. ## Customers
  107. Customer stories — how teams use Resend in production. The index enumerates every customer story as a flat list of links. Append `.md` to any customer URL, or send `Accept: text/markdown`, to receive the raw markdown source.
  109. - [Customers index (Markdown)](https://resend.com/customers.md)
  110. - [Customers index (HTML)](https://resend.com/customers)
  111. - Example: [https://resend.com/customers/airgoods.md](https://resend.com/customers/airgoods.md)
  113. ## Legal
  115. Terms of service, privacy policy, DPA, and other legal documents. The index enumerates every legal document as a flat list of links. Append `.md` to any legal URL, or send `Accept: text/markdown`, to receive the raw markdown source.
  117. - [Legal index (Markdown)](https://resend.com/legal.md)
  118. - [Legal index (HTML)](https://resend.com/legal)
  119. - Example: [https://resend.com/legal/terms-of-service.md](https://resend.com/legal/terms-of-service.md)
  121. ## Migrate
  123. Guides for migrating from other email providers to Resend. The index enumerates every migration guide as a flat list of links. Append `.md` to any migration URL, or send `Accept: text/markdown`, to receive the raw markdown source.
  125. - [Migrate index (Markdown)](https://resend.com/migrate.md)
  126. - [Migrate index (HTML)](https://resend.com/migrate)
  127. - Example: [https://resend.com/migrate/sendgrid.md](https://resend.com/migrate/sendgrid.md)
  129. ## Security
  131. Security and compliance documentation — GDPR, SOC 2, responsible disclosure. The index enumerates every security document as a flat list of links. Append `.md` to any security URL, or send `Accept: text/markdown`, to receive the raw markdown source.
  133. - [Security index (Markdown)](https://resend.com/security.md)
  134. - [Security index (HTML)](https://resend.com/security)
  135. - Example: [https://resend.com/security/soc-2.md](https://resend.com/security/soc-2.md)
  137. ## SDKs
  139. The official libraries maintained by the Resend team for each platform.
  141. - [Node.js](https://github.com/resend/resend-node)
  142. - [Python](https://github.com/resend/resend-python)
  143. - [PHP](https://github.com/resend/resend-php)
  144. - [Ruby](https://github.com/resend/resend-ruby)
  145. - [Go](https://github.com/resend/resend-go)
  146. - [Java](https://github.com/resend/resend-java)
  147. - [Laravel](https://github.com/resend/resend-laravel)
  148. - [Rust](https://github.com/resend/resend-rust)
  149. - [.NET](https://github.com/resend/resend-dotnet)

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Last checked
Oct 8, 2026
Last changed
Oct 8, 2026
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