Official (Vendor)Active· 7d★ 4.3by Resend

Resend

Resend's official MCP for transactional email. Send, list, schedule from Claude — straightforward, fast, well-documented.

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Safety & Trust

Delv Safety Grade: A

Score 84/100 · assessed 2026-04-28

Maintainer92

Permissions75

Supply chain88

Transparency82

Incidents100

Resend's official MCP server provides transactional email capabilities through a well-established commercial provider. The maintainer score is strong given Resend's position as a funded, professional email infrastructure company with active development. Permissions are moderately scoped: the server can send emails on your behalf, read recent sends, and schedule messages, which represents meaningful write access to external communications. Supply chain is solid with npm distribution and standard installation, though dependency pinning could be verified. Transparency is good with open source code and documentation, though the repository is relatively new. No known security incidents. The main consideration is that an API key grants Claude the ability to send emails from your domain, so credential management and usage monitoring are important. Suitable for teams already using Resend who want AI-assisted email workflows.

Lethal Trifecta (prompt-injection exposure)

ONE OF THREE

Private dataNo

Reads secrets, credentials, private files

Untrusted inputNo

Ingests web pages, PRs, issues, emails

External commsYes

Can send data outbound

Email sender only. Cannot read inbox.

Green flags

Official vendor implementation from established email infrastructure company
Scoped to single domain (email) with clear API boundaries
Standard npm distribution with straightforward installation
Open source with documentation at resend.com/docs/agents/mcp
No known security incidents or credential leaks

Red flags

API key grants full email sending capability from your domain
Can send to arbitrary recipients without additional confirmation
Scheduled emails execute later, outside immediate oversight

Permissions requested

Outbound networkAccess secretsSend messagesRead messages

Assessed by Delv Editorial using public metadata. Grades are advisory and update as the ecosystem changes. They do not replace your own review of permissions and code before granting an agent access to sensitive systems.

Install

npx -y resend-mcp

Env vars needed: RESEND_API_KEY

Review

Resend's official MCP server does one thing: it lets Claude send, list, and schedule transactional emails through your Resend account. No frills, no feature bloat. You authenticate with an API key, and suddenly Claude can draft and dispatch emails on your behalf, pull recent sends, or queue messages for later delivery. I'd reach for this when I'm prototyping notification systems or automating customer comms without leaving my editor. Ask Claude to send a welcome email to a new user, and it composes the HTML, calls the Resend API, and confirms delivery. You can also query recent sends to debug bounces or check delivery status. The scheduling feature is handy for follow-ups or timed campaigns, though you'll still need to manage templates and branding outside the MCP. The implementation is clean and well-documented. Resend maintains this themselves, so it tracks their API closely and updates promptly. Setup is trivial if you already have a Resend account: drop your API key into the environment, add the server to your Claude config, and you're live. The tool respects Resend's domain verification rules, so you can't just fire off emails from arbitrary addresses without prior setup on the Resend side. Quirks are minimal. You're still bound by Resend's rate limits and domain policies, so this isn't a workaround for those constraints. The MCP doesn't expose every Resend feature—broadcast campaigns and advanced analytics live in the web dashboard—but for transactional workflows, it's complete. If you're not already using Resend, this won't convince you to switch; it's a convenience layer, not a selling point. Who shouldn't bother: anyone not already on Resend, or developers who need complex templating logic that belongs in a proper email service integration. If you're sending one-off emails occasionally, the web UI is faster. But if you're building workflows where Claude needs to send confirmations, alerts, or scheduled reminders as part of a larger automation, this is the shortest path from prompt to inbox.

Verdict

Install this if you're already using Resend and want Claude to handle email sends without context-switching. Skip it if you're not committed to Resend's ecosystem or only send emails manually. It's a focused, well-maintained tool that does exactly what it claims and nothing more.

Good at

Official vendor support means it stays current with Resend's API and gets prompt fixes.
Setup is trivial if you already have a Resend account—one environment variable and you're done.
Scheduling and listing recent sends are genuinely useful for debugging and timed workflows.
Clean, minimal implementation with no unnecessary abstractions or feature creep.

Watch out

Only useful if you're already committed to Resend—it won't sway you to switch providers.
Doesn't expose advanced Resend features like broadcast campaigns or detailed analytics.
You're still bound by Resend's rate limits and domain verification rules, which can trip up new users.
Manual config required for hosts beyond Claude Desktop, though the docs cover it.

Getting started

1. Grab your Resend API key from the Resend dashboard and verify your sending domain if you haven't already. 2. Set the RESEND_API_KEY environment variable in your shell or host config. 3. Add the server to your Claude Desktop config (or whichever host you're using) by pointing to the GitHub repo or installing via npx. 4. Restart Claude and ask it to list recent emails or send a test message to confirm the connection. 5. Watch out for Resend's domain verification requirements—Claude can't send from unverified addresses, and the error messages can be cryptic if you skip this step.

Works with

Claude DesktopClaude CodeCursorWindsurfClineZed