EMAIL OPERATIONS / Resend
Resend MCP
Connects an assistant to Resend email sending, delivery records and account operations through hosted or local MCP.
“Connect your AI agent to the Resend platform.”
01 / THE REASONING
Why this made the selection.
- Adds a concrete outbound-email workflow, including message inspection and scheduled-email operations.
- The current publisher implementation can be inspected alongside hosted OAuth setup, making its broader account permissions visible.
02 / THE REVIEW RECORD
What we actually inspected.
Source review has boundaries.
A clear record is more useful than a “safe” badge.
Material inspected
- README.md: current package identity, hosted OAuth endpoint and client-specific setup.
- package.json, src/index.ts and src/cli/resolve.ts: executable, runtime and credential requirements.
- src/server.ts, src/tools/emails.ts and src/transports/http.ts: tool registration, sends, attachments and HTTP sessions.
- LICENSE: MIT for repository source.
- src/tools/apiKeys.ts: key creation, listing and removal tools.
Our findings
- The server registers administration tool groups as well as email tools, so a narrow send-only description would omit material authority.
- The send handler reads filePath attachments with fs.readFile and calls resend.emails.send; client-side review must happen before that tool executes.
- Stdio requires RESEND_API_KEY at startup. HTTP uses connecting-client credentials; the hosted OAuth path is documented separately.
- The API-key creation tool returns the newly created token in its MCP result, so key administration also exposes credentials to the connected host.
- The local HTTP source calls app.listen(port) without a bind address even though its log prints a loopback URL; that log is not evidence of network isolation.
Not established by this review
- No server, account connection, email send, attachment access, delivery flow or authentication isolation was executed.
The review applies to the material and revision named here. A newer upstream release can change its behavior.
03 / PUT IT TO WORK
Connect a server deliberately.
DOCUMENTED COMMAND
claude mcp add --transport http resend https://mcp.resend.com/mcpCopying does not execute this command. It may retrieve a newer version than the reviewed source.
- The command configures Resend’s hosted service in Claude Code; open /mcp and complete OAuth.
- The JSON example is for Cursor. Use the publisher’s matching guide for other clients.
- For local stdio, provide RESEND_API_KEY securely to the documented npx -y resend-mcp process and verify the sending domain before sending.
Before you start
- A Resend account with the required sending/domain permissions and an appropriate MCP client.
- For local execution, a compatible Node.js runtime and a Resend API key.
Documented configuration example
Use the client and authentication context described in the setup guidance. Configuration formats vary between hosts.
{
"mcpServers": {
"resend": {
"url": "https://mcp.resend.com/mcp"
}
}
}04 / FOLLOW THE EVIDENCE
The source trail.
Our notes are separate from the original resource.
Check upstream before adopting a new version.
https://github.com/resend/resend-mcp/blob/e6f9faa56ab014e883739c160433f96e55c98eff/README.md
Supports: upstreamDescription, descriptionSourceUrl, summary, whySelected, bestFor, install, compatibility, transports, configExample, access
https://github.com/resend/resend-mcp/blob/e6f9faa56ab014e883739c160433f96e55c98eff/src/server.ts
Supports: summary, whySelected, review, access, limitations
https://github.com/resend/resend-mcp/blob/e6f9faa56ab014e883739c160433f96e55c98eff/src/tools/emails.ts
Supports: bestFor, review, access, limitations
- Credential configuration ↗Checked
https://github.com/resend/resend-mcp/blob/e6f9faa56ab014e883739c160433f96e55c98eff/src/cli/resolve.ts
Supports: review, install, access
https://github.com/resend/resend-mcp/blob/e6f9faa56ab014e883739c160433f96e55c98eff/src/transports/http.ts
Supports: review, transports, limitations
- Package manifest ↗Checked
https://github.com/resend/resend-mcp/blob/e6f9faa56ab014e883739c160433f96e55c98eff/package.json
Supports: language, install.prerequisites
- Resend service plans ↗Checked
https://resend.com/pricing
Supports: access.cost
- Repository licence ↗Checked
https://github.com/resend/resend-mcp/blob/e6f9faa56ab014e883739c160433f96e55c98eff/LICENSE
Supports: license
https://github.com/resend/resend-mcp/blob/e6f9faa56ab014e883739c160433f96e55c98eff/src/tools/apiKeys.ts
Supports: access, limitations, review