Groundmail/groundmail-mcp

Send transactional email and manage domains, templates, webhooks and suppressions
from Claude, Claude Code, ChatGPT, Cursor and any other MCP client.
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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
| Client | How to connect |
| Claude Code | claude mcp add --transport http groundmail https://mcp.groundmail.dev/mcp, then run /mcp, pick groundmail and choose Authenticate |
| Cursor | Add { "mcpServers": { "groundmail": { "url": "https://mcp.groundmail.dev/mcp" } } } to .cursor/mcp.json; Cursor shows "Needs login" |
| Claude.ai | Settings → Connectors → Add custom connector → paste the URL |
| ChatGPT | Settings → Apps & Connectors → Create (developer mode) → paste the URL, authentication OAuth |
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, GoDaddy, Netlify, DigitalOcean or DNSimple, 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
| Mode | Command / URL | Auth |
| HTTP (hosted) | https://mcp.groundmail.dev/mcp | OAuth (recommended) or Authorization: Bearer gm… |
| stdio | npx -y groundmail-mcp | GROUNDMAILAPIKEY=gm… |
| HTTP (local) | npx -y groundmail-mcp --http --port 3000 | Authorization: Bearer gm… on each request |
Optional: GROUNDMAILAPIURL (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:
json
"mcpServers": {
"groundmail": {
"command": "npx",
"args": ["-y", "groundmail-mcp"],
"env": {
"GROUNDMAILAPIKEY": "gmyourkeyhere"
Cursor with an API key (local or hosted HTTP)
bash
npx -y groundmail-mcp --http --port 3000
json
"mcpServers": {
"groundmail": {
"url": "http://127.0.0.1:3000/mcp",
"headers": {
"Authorization": "Bearer gmyourkeyhere"
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
bash
# Hosted, API key