zoho-mail-mcp

A Model Context Protocol (MCP) server that gives Claude read access to Zoho Mail — list and search your inbox, read full email content, and save draft replies for you to review and send yourself. It never sends anything on its own.

Why this exists

Claude chat doesn't ship with a first party Zoho connector. This server fills that gap the same way github-mcp fills it for GitHub: a small local server Claude Desktop talks to over stdio, authenticated with your own Zoho credentials.

What it can do

List folders (Inbox, Drafts, Sent, custom folders)
List recent emails in a folder
Search emails using Zoho Mail's search syntax
Read the full content of a specific email
Save a draft reply to an email, properly threaded (To, Re: subject, and the reply headers filled in automatically)
Save a new draft from scratch

It cannot send email. There is no send tool, on purpose — every draft it creates sits in your Drafts folder until you open it in Zoho Mail and send it yourself.

Setup

1. Clone and install

git clone https://github.com/JessicaTemplet/zoho-mail-mcp.git
cd zoho-mail-mcp
npm install
npm run build

2. Register a Self Client in the Zoho API Console

Zoho Mail's API uses OAuth2, not a simple token like GitHub's PATs, but for a personal script like this one, Zoho has a "Self Client" flow that skips the browser consent screen entirely.

Go to api-console.zoho.com and sign in with the same Zoho account as your mailbox.
Click GET STARTED, hover over Self Client, click CREATE NOW, then CREATE and OK.
You'll land on a Client Secret tab showing a Client ID and Client Secret. Copy both — you'll need them below.

3. Generate an authorization code, then trade it for a refresh token

Still in the API Console, on the same Self Client:

Click the Generate Code tab.

Scope: paste this exactly —

ZohoMail.accounts.READ,ZohoMail.folders.READ,ZohoMail.messages.READ,ZohoMail.messages.CREATE

Set an expiry time (10 minutes is plenty — you're about to use it immediately) and a description (e.g. "claude mcp"), then click CREATE.
Copy the authorization code it generates. It's only valid for the window you picked, so move to the next step right away.
Exchange it for tokens. Run this in a terminal (replace the three bracketed values):
```
curl "https://accounts.zoho.com/oauth/v2/token?client_id=[CLIENT_ID]&client_secret=[CLIENT_SECRET]&grant_type=authorization_code&code=[AUTH_CODE]"
```
If your Zoho Mail is on a non-US data center (the URL you use to check mail is mail.zoho.eu, .in, etc. instead of mail.zoho.com), use accounts.zoho.eu / .in / etc. here instead.
The response is JSON with an access_token (ignore it, it expires in an hour) and a refresh_token (this is the one that matters — it doesn't expire on its own). Save the refresh token somewhere safe.

4. Add it to your Claude Desktop config

Open Claude Desktop → Settings → Developer → Edit Config, and add:

{
  "mcpServers": {
    "zoho-mail": {
      "command": "node",
      "args": ["/absolute/path/to/zoho-mail-mcp/dist/index.js"],
      "env": {
        "ZOHO_CLIENT_ID": "your-client-id",
        "ZOHO_CLIENT_SECRET": "your-client-secret",
        "ZOHO_REFRESH_TOKEN": "your-refresh-token"
      }
    }
  }
}

If your account is outside the US data center, also add "ZOHO_DATA_CENTER": "eu" (or in, com.au, jp, ca, sa) to the env block.

5. Restart Claude Desktop

Notes

Credentials are read from environment variables at runtime and never written to disk by this server. Don't commit a .env file or your refresh token to this repo.
The refresh token doesn't expire on its own, but you can revoke it anytime from the API Console if you need to cut off access.
Built against the official @modelcontextprotocol/sdk, using native fetch for the Zoho REST calls (no Zoho SDK exists for this).

License

MIT, see LICENSE.