MCP.Market

Mailly MCP server

online · 100% uptime
by mailly.site·site.mailly/mcp·v0.3.1
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A real inbox for agents: read mail, draft replies you approve, wait for verification codes.

A97/100grade A
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Safety scan
A97/100

full report

Adoption
Growing

0 stars

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Mailly tools

Tool list not cached yet. `describe` through the gateway fetches it live.

Public scan report

scanner v0.1.10 · 2026-10-28 · same rubric, same numbers if you re-run it

no findings
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 216ms (auth required)20/20
  • –Tool poisoningtools not inspected (endpoint requires auth); not countedn/a
  • Auth qualityOAuth resource metadata advertised on 40115/15
  • Maintenancelast push 1 days ago15/15
  • Maintainer identityendpoint served from the registry-verified namespace domain8/10
Overall 97/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Mailly compares

Against every graded Email MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
97/100
higher than 95% of 916 Email servers
Uptime
100%
of our recent checks; the typical remote Email server answers 100%
Response time
220 ms
faster than 63% of 609 Email servers

Install Mailly in Claude Code, Cursor or VS Code

claude mcp add --transport http mcp https://mcp.mailly.site/mcp
Add to Cursor

What the publisher says

From the Mailly repository's README, as published. We do not edit it. Read it on GitHub

mailly-mcp

The MCP server behind Mailly's connector, plus the Mailly plugin for Claude and Codex.

domains, contacts, templates, campaigns, workflows and webhooks. Every tool calls the Mailly REST API with the caller's Mailly API key, so authentication, billing and workspace isolation all stay in the API.

  • src/: the MCP server, a Cloudflare Worker. It offers typed tools for Mailly mail, drafts, sending,

MCP_APPS=1.

  • ui/: the MCP Apps UI (email and draft cards), bundled into ui:// resources. It is off unless

points at the hosted server and adds a skill for working with email safely.

  • plugins/mailly: the plugin for Claude (claude.ai, Cowork and Claude Code) and Codex. It

Use the hosted server

Add https://mcp.mailly.site/mcp as a remote MCP server and sign in with your Mailly account (OAuth). In Claude Code you can install the plugin instead:

/plugin install mailly --marketplace superagents-lab/mailly-mcp

This server is an OAuth protected resource. Mailly's API (https://api.mailly.site/api/auth) is the authorization server: clients find it through /.well-known/oauth-protected-resource, sign the user in there, and send the access token here. The server passes the token, or an API key, unchanged to Mailly's REST API, which checks it and the scopes it carries. The tool list is narrowed to the same scopes (GET /me).

Run it yourself

npm install
npm run dev          # wrangler dev on http://localhost:8787/mcp

Call /mcp with Authorization: Bearer (from https://mailly.site/app/developers). Without the MAILLYAPI service binding it calls MAILLYAPI_URL (default https://api.mailly.site) over the internet. To host your own copy, change the mcp.mailly.site route in wrangler.jsonc. OAuth sign-in only works at https://mcp.mailly.site/mcp, because Mailly issues tokens for that resource; elsewhere use an API key.

Develop

npm run typecheck
npm test             # builds dist/worker.js and runs it in Miniflare against a stub API

The Mailly server repository runs its OAuth and end-to-end tests against dist/worker.js from a sibling checkout of this repository.

server.json is the listing in the MCP Registry as site.mailly/mcp. The site.mailly namespace is proven by a DNS TXT record on mailly.site, so publish with mcp-publisher login dns --domain mailly.site --private-key and mcp-publisher publish from a machine that holds the key. Bump version for each release.

License

MIT

Nothing above is checked by us. What we check is on the safety report.

Mailly: common questions

Is Mailly MCP server safe?
Yes, by our scan: it is graded A (97/100). Read the Mailly safety report
How do I install Mailly?
It runs remotely at mcp.mailly.site. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Mailly need an API key?
No key to paste: it signs you in with OAuth when your client connects.
Is Mailly maintained?
The last commit was 8 days ago (2026-10-27). The latest release is v0.3.1.
Is Mailly up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of Mailly?
Servers from other publishers that do the same job: Agenticmail MCP server, Inbox Zero MCP server and Atomic Mail MCP server.
How does Mailly compare with other Email MCP servers?
safety score 97/100 (higher than 95% of 916 Email servers); uptime 100% (of our recent checks; the typical remote Email server answers 100%); response time 220 ms (faster than 63% of 609 Email servers). Full comparison.

Alternatives to Mailly

Same job from other publishers: the closest match first, then the best rated.

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