Groundmail

Groundmail MCP server

Send transactional email and manage domains, templates, webhooks and suppressions

from Claude, Claude Code, ChatGPT, Cursor and any other MCP client.

Docs · Get a free account · groundmail.dev

Quick start

The fastest way is the hosted server. Add the URL, sign in through your browser, and you're done. No API key to copy.

https://mcp.groundmail.dev/mcp

When you connect, you choose the access: Full, Send only or Read only. Revoke it any time in Groundmail under Settings → CLIs & agents.

What you can ask for

"Send a password reset email to ada@example.com from noreply@mail.acme.com."

"Did my last 10 emails get delivered? Show any bounces."

"Add mail.acme.com as a sending domain and apply the DNS records on Cloudflare."

"How is my deliverability over the last 7 days?"

Tools cover emails (send, list, look up), domains (add, apply DNS through Cloudflare, Vercel or GoDaddy, verify), templates, webhooks, suppressions, address validation, deliverability, DMARC monitoring, email testing (a test address per run, then wait for the email and read its code and links), imports from other providers and tenants (one per customer you send for: create, update, pause, resume, stats; tenant on sends, domains and suppressions). Each tool carries read-only and destructive annotations and an output schema. Full list: docs.groundmail.dev/ai/mcp.

Transports

Optional: GROUNDMAIL_API_URL (for example http://localhost:3003/api against a local API).

Local HTTP endpoint: http://127.0.0.1:3000/mcp · health: GET /health Hosted health: GET https://mcp.groundmail.dev/health

Cursor with an API key (stdio)

.cursor/mcp.json:

{

"mcpServers": { "groundmail": { "command": "npx", "args": ["-y", "groundmail-mcp"], "env": { "GROUNDMAIL_API_KEY": "gm_your_key_here" } } } }

Cursor with an API key (local or hosted HTTP)

npx -y groundmail-mcp --http --port 3000

{

"mcpServers": { "groundmail": { "url": "http://127.0.0.1:3000/mcp", "headers": { "Authorization": "Bearer gm_your_key_here" } } } }

For the hosted server with a key instead of OAuth, use "url": "https://mcp.groundmail.dev/mcp" with the same header.

Claude Code with an API key

# Hosted, API key

claude mcp add --transport http groundmail https://mcp.groundmail.dev/mcp \ --header "Authorization: Bearer $GROUNDMAIL_API_KEY"

Local stdio

claude mcp add groundmail --env GROUNDMAIL_API_KEY=gm_your_key_here -- npx -y groundmail-mcp

Want your coding agent to know Groundmail too? Install the agent skills: npx skills add Groundmail/groundmail-skills -y.

Why Groundmail

• Our own mail servers and IP space. Your password resets and receipts don't share a pool with bulk marketing senders.
• Transactional email only. No newsletters or cold outreach on the platform, which keeps the sending reputation clean.
• Start free. Free covers 3,000 emails a month. After that, pay as you go is $15 a month with 20,000 emails included, then from $0.70 per 1,000, less as you grow. Pricing
• Built for code and for agents. REST API, SMTP, SDKs for Node, Python, Go, PHP and Ruby, a CLI, and an MCP server for Claude, ChatGPT and Cursor.

All Groundmail libraries

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