# n24q02m/better-email-mcp [Health: Active] **Category:** 💬 Communication **Repository:** https://github.com/n24q02m/better-email-mcp **GitHub Stars:** 34 **npm Downloads (last month):** 2921 **Views:** 2 **Installs:** 0 **Upvotes:** 0 **Directory Page:** https://allmcps.com/mcp/n24q02m-better-email-mcp ## Description IMAP/SMTP email MCP server with App Passwords (no OAuth2). Auto-discovers Gmail, Outlook, Yahoo, iCloud. 5 composite tools: search, read, send, reply, forward. Multi-account support. ## Tools Capabilities this server exposes over MCP: - **messages** — Search, read, organize, compose, reply to, and forward emails - **folders** — List mailbox folders - **attachments** — List and download email attachments - **config** — Credential setup via browser relay, status check, reset, re-resolve, cache clear - **config__open_relay** — Open the relay configuration form in the browser and return the relay URL - **help** — Get full documentation for any tool ## Claude Desktop Quick Installation Install path detected from listing signals. Uses `npx` (confidence: high): ```json "mcpServers": { "better-email-mcp": { "command": "npx", "args": ["-y","@n24q02m/better-email-mcp"], "env": { "BETTER_EMAIL_MCP_ACCOUNTS": "" } } } ``` **Requires environment variables:** `BETTER_EMAIL_MCP_ACCOUNTS` — the values above are empty placeholders; fill in real credentials before running (see the repository for what each one is for). ## Documentation & README # Better Email MCP mcp-name: io.github.n24q02m/better-email-mcp **IMAP/SMTP email for AI agents -- read, send, organize folders, and manage attachments across multiple accounts, with auto-discovery.** [![CI](https://github.com/n24q02m/better-email-mcp/actions/workflows/ci.yml/badge.svg)](https://github.com/n24q02m/better-email-mcp/actions/workflows/ci.yml) [![codecov](https://codecov.io/gh/n24q02m/better-email-mcp/graph/badge.svg?token=O2GWBWCZGF)](https://codecov.io/gh/n24q02m/better-email-mcp) [![npm](https://img.shields.io/npm/v/@n24q02m/better-email-mcp?logo=npm&logoColor=white)](https://www.npmjs.com/package/@n24q02m/better-email-mcp) [![Docker](https://img.shields.io/docker/v/n24q02m/better-email-mcp?label=docker&logo=docker&logoColor=white&sort=semver)](https://hub.docker.com/r/n24q02m/better-email-mcp) [![License: Apache-2.0](https://img.shields.io/github/license/n24q02m/better-email-mcp)](LICENSE) [![TypeScript](https://img.shields.io/badge/TypeScript-3178C6?logo=typescript&logoColor=white)](#) [![Node.js](https://img.shields.io/badge/Node.js-5FA04E?logo=nodedotjs&logoColor=white)](#) [![IMAP/SMTP](https://img.shields.io/badge/IMAP%2FSMTP-005FF9?logo=maildotru&logoColor=white)](#) [![semantic-release](https://img.shields.io/badge/semantic--release-e10079?logo=semantic-release&logoColor=white)](https://github.com/python-semantic-release/python-semantic-release) [![Renovate](https://img.shields.io/badge/renovate-enabled-1A1F6C?logo=renovatebot&logoColor=white)](https://developer.mend.io/)
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## Table of contents - [Features](#features) - [Install](#install) - [CLI](#cli) - [Smithery](#smithery) - [Documentation](#documentation) - [Tools](#tools) - [Comparison](#comparison) - [Remote (HTTP Mode)](#remote-http-mode) - [Outlook OAuth Device Code (HTTP mode)](#outlook-oauth-device-code-http-mode) - [Configuration](#configuration) - [Security](#security) - [Build from Source](#build-from-source) - [Deploy to Cloudflare](#deploy-to-cloudflare) - [Trust Model](#trust-model) - [License](#license) Better Email MCP server ## Features - **Multi-account support** -- manage 6+ email accounts (Gmail, Outlook, Yahoo, iCloud, Zoho, ProtonMail, custom IMAP) - **App Passwords** -- no OAuth2 setup required for most providers; clone and run in 1 minute - **4 composite tools** with 22 actions (plus `help` + `config__open_relay`) -- search, read, send, reply, forward, organize, and credential setup in single calls - **Auto-discovery** -- provider settings detected from email address, custom IMAP host supported - **Thread-aware** -- reply/forward maintains In-Reply-To and References headers - **Tiered token optimization** -- compressed descriptions + on-demand `help` tool + MCP Resources ## Install The server runs in two modes: **stdio** (default, single-user, credentials from env vars) and **HTTP** (opt-in, multi-user with OAuth 2.1). For stdio, add it to your MCP client config: ```jsonc { "mcpServers": { "better-email": { "command": "npx", "args": ["--yes", "@n24q02m/better-email-mcp@latest"], "env": { "EMAIL_CREDENTIALS": "user@gmail.com:app-password" } } } } ``` Multiple accounts are comma-separated: `user1@gmail.com:pass1,user2@outlook.com:pass2`. See [Configuration](#configuration) for all env vars, and [Remote (HTTP Mode)](#remote-http-mode) to run a hosted multi-user server. Most providers use an **App Password** (no OAuth setup); Outlook/Hotmail/Live use a bundled OAuth device-code flow in HTTP mode. Settings (IMAP/SMTP host, port) are auto-discovered from the email domain. ## CLI The package ships one binary, `better-email-mcp` (run via `npx @n24q02m/better-email-mcp`). With no arguments it starts the MCP server over stdio; it also accepts one flag and one subcommand: | Invocation | Description | |:-----------|:------------| | `better-email-mcp` | Start the MCP server over **stdio** (default). Reads credentials from `EMAIL_CREDENTIALS`, or from `EMAIL_USER` + `EMAIL_APP_PASSWORD` | | `better-email-mcp --http` | Start the server in **HTTP** (multi-user, OAuth 2.1) mode. Equivalent to `MCP_TRANSPORT=http` or `TRANSPORT_MODE=http` | | `better-email-mcp auth [outlook] [--client-id=]` | Authenticate an Outlook/Hotmail/Live account via OAuth2 Device Code flow. Tokens are saved to `~/.better-email-mcp/tokens.json`. The `outlook` provider positional is optional (email has a single OAuth2 provider); `--client-id` overrides `OUTLOOK_CLIENT_ID` for a self-hosted Azure AD app | | `better-email-mcp logout []` | Clear the locally stored Outlook token(s). Omit `` to clear every stored token | ```bash # stdio server (normally launched by your MCP client, not by hand) EMAIL_CREDENTIALS="user@gmail.com:app-password" npx @n24q02m/better-email-mcp # HTTP multi-user server npx @n24q02m/better-email-mcp --http # One-off Outlook OAuth device-code sign-in npx @n24q02m/better-email-mcp auth user@outlook.com # Sign out of a single account (or omit the email to clear all) npx @n24q02m/better-email-mcp logout user@outlook.com ``` `auth`/`logout` are only for Outlook/Hotmail/Live addresses -- other providers use an App Password in `EMAIL_CREDENTIALS`. See [Remote (HTTP Mode)](#remote-http-mode) for the HTTP config. ## Smithery Published with a [Smithery](https://smithery.ai) config ([`smithery.yaml`](https://github.com/n24q02m/better-email-mcp/blob/HEAD/smithery.yaml)). Smithery runs the server over **stdio** with no build config required; credentials are supplied at runtime through the server's own setup flow (see [Configuration](#configuration)). The start command is: ```yaml startCommand: type: stdio commandFunction: |- (config) => ({ command: 'npx', args: ['-y', '@n24q02m/better-email-mcp'] }) ``` ## Documentation Full docs at **[mcp.n24q02m.com/servers/better-email-mcp/setup/](https://mcp.n24q02m.com/servers/better-email-mcp/setup/)**: - [Setup](https://mcp.n24q02m.com/servers/better-email-mcp/setup/) -- install methods for Claude Code, Codex, Gemini CLI, Cursor, Windsurf, mcp.json - [Modes overview](https://mcp.n24q02m.com/get-started/modes-overview/) -- stdio (default) and HTTP (opt-in, multi-user with OAuth 2.1) - [Multi-user setup](https://mcp.n24q02m.com/get-started/multi-user/) -- per-JWT-sub credential model **Install with AI agent** -- paste this to your AI coding agent: > Install MCP server `better-email-mcp` following the steps at > https://raw.githubusercontent.com/n24q02m/claude-plugins/main/plugins/better-email-mcp/setup-with-agent.md ## Tools ### Public tool rename The public `send` tool is replaced by `messages` with `action: new`, `reply`, or `forward`. This follows the MCP N+2 standard: sending is an action in the messages domain, so keeping a separate `send` entry would duplicate that domain and add redundant tool-list and help-topic surface. The old name is removed directly; there is no compatibility alias. | Old public name | New public name | Reason | Alias removal | |:----------------|:----------------|:-------|:---------------| | `send` | `messages` (`action: new \| reply \| forward`) | N+2 domain-tool rule: outbound mail is part of the `messages` mega-tool, not a second action-level tool. | Removed directly in the Unreleased release; no alias | | Tool | Actions | Description | |:-----|:--------|:------------| | `messages` | `search`, `read`, `mark_read`, `mark_unread`, `flag`, `unflag`, `move`, `archive`, `trash`, `new`, `reply`, `forward` | Search, read, organize, compose, reply to, and forward emails | | `folders` | `list`, `status` | List mailbox folders or read targeted IMAP STATUS metadata | | `attachments` | `list`, `download` | List and download email attachments | | `config` | `status`, `setup_status`, `setup_start`, `setup_reset`, `setup_complete`, `set`, `cache_clear` | Credential setup via browser relay, status check, reset, re-resolve, cache clear | | `config__open_relay` | - | Open the relay configuration form in the browser and return the relay URL | | `help` | - | Get full documentation for any tool | ### MCP Resources | URI | Description | |:----|:------------| | `email://docs/messages` | Message operations reference | | `email://docs/folders` | Folder operations reference | | `email://docs/attachments` | Attachment operations reference | | `email://docs/help` | Full documentation | | `email://docs/config` | Credential setup and runtime configuration reference | ## Comparison How better-email-mcp stacks up against direct competitors in each pillar: | Capability | better-email-mcp | [email-mcp](https://github.com/codefuturist/email-mcp) | [Gmail-MCP-Server](https://github.com/GongRzhe/Gmail-MCP-Server) | [mcp-mail-server](https://github.com/yunfeizhu/mcp-mail-server) | |---|---|---|---|---| | IMAP/SMTP (provider-agnostic) | Yes | Yes | No (Gmail API only) | Yes | | Multi-account | Yes (comma-separated creds) | Yes | No (single global credential) | No (single account per instance) | | App Passwords | Yes (no OAuth setup) | Yes | No (OAuth2 only) | Yes | | Auto-discovery from email address | Yes | Yes (8 providers) | n/a (Gmail only) | No (manual host/port) | | Bundled Outlook OAuth (no user Azure app) | Yes (device-code, Thunderbird-pattern client) | partial (OAuth2 XOAUTH2, experimental) | No (user-supplied Google OAuth) | No | | Attachments (list + download) | Yes | Yes | Yes | Yes | | HTTP multi-user mode (per-JWT-sub) | Yes (OAuth 2.1, self-hostable) | No (stdio only) | No (stdio only) | No (stdio only) | ## Remote (HTTP Mode) Run as a multi-user HTTP server with OAuth 2.1 authentication: ```jsonc { "mcpServers": { "better-email": { "type": "http", "url": "https:///mcp" } } } ``` ### Self-Hosting (HTTP Mode) Single multi-user mode (relay form for App-Password providers + bundled Outlook OAuth device-code): ```bash export CREDENTIAL_SECRET='replace-with-a-stable-secret' docker run -p 8080:8080 \ -e PORT=8080 \ -e PUBLIC_URL=https://your-domain.com \ -e MCP_STORAGE_BACKEND=local \ -e HOME=/data \ -e CREDENTIAL_SECRET="$CREDENTIAL_SECRET" \ -v email-data:/data \ n24q02m/better-email-mcp:latest ``` Users provide their own email credentials through the OAuth flow / paste form. No server-side `EMAIL_CREDENTIALS` is needed. The stable `CREDENTIAL_SECRET` encrypts the local per-user credential files; the mounted `/data` volume survives container restarts. Without that volume, the container filesystem remains ephemeral. Cloudflare deployments use Workers KV instead. ### Cloudflare serverless mode (KV-only) Self-hostable as a per-user serverless instance on Cloudflare Workers + Containers: each JWT `sub` gets its own Container Durable Object, and all credentials AND Outlook OAuth tokens are AES-256-GCM encrypted into Workers KV (one `subs//config` blob per user) so they **survive scale-to-zero / container recreate with no re-auth**. The JWT signing key is derived deterministically from `CREDENTIAL_SECRET` (EdDSA), so the user's identity is stable across recreate. Required secrets: `CREDENTIAL_SECRET` (per-sub vault + EdDSA), `MCP_RELAY_PASSWORD` (form gate), `MCP_DCR_SERVER_SECRET` (intentional multi-user deploy). See `wrangler.jsonc`. > Keying Outlook tokens by JWT `sub` (in the per-sub KV blob) resolves the former > email-keyed `tokens.json` ambiguity (CLAUDE.md Known Bug #4): two users' Outlook > accounts can no longer collide. > Caveat: `localhost` IMAP accounts (`email:pass:localhost:1993`) are valid for > local / VM deployments but CANNOT work on Cloudflare — there is no co-located IMAP > proxy inside the container. Use a publicly-reachable IMAP host on CF. ## Outlook OAuth Device Code (HTTP mode) In HTTP mode, Outlook/Hotmail/Live accounts use OAuth2 device-code automatically. On first use: 1. The server prints a device code and a Microsoft login URL 2. Open the URL in a browser and enter the code 3. Sign in and authorize the app 4. Tokens are persisted per JWT sub — in the encrypted Cloudflare KV credential blob (`subs//config`) on the serverless deploy, in the local in-memory store for local HTTP, or in `~/.better-email-mcp/tokens.json` for single-user / stdio OAuth uses the bundled public Azure client (`d56f8c71-9f7c-43f4-9934-be29cb6e77b0`, Thunderbird-pattern) -- no user-side Azure registration needed. In **stdio mode**, Outlook accounts use an **App Password** instead (Outlook Account Settings → Security → Advanced security options → App passwords). ## Configuration To trust mise configuration automatically, set `trusted_config_paths` in the user-level config at `~/.config/mise/config.toml`; do not add it to this project's `.mise.toml`. | Variable | Required | Default | Description | |:---------|:---------|:--------|:------------| | `EMAIL_CREDENTIALS` | Yes (stdio) | - | Email credentials, `email:app-password` per account, comma-separated for multi-account. Optional custom IMAP host/port: `email:password:imap_host:imap_port` | | `EMAIL_USER` | Alternative (stdio, single-account) | - | Email address. Used with `EMAIL_APP_PASSWORD` as a per-field alternative to `EMAIL_CREDENTIALS`; merged into `EMAIL_CREDENTIALS` at boot | | `EMAIL_APP_PASSWORD` | Alternative (stdio, single-account) | - | App password (Gmail/Yahoo/iCloud) or Outlook App Password; used with `EMAIL_USER` | | `PUBLIC_URL` | No (http) | - | Server's public URL for relay / OAuth redirect links | | `PORT` | No | `0` (OS-assigned) | Server port (http mode); set explicitly (e.g. `8080`) to bind a fixed port | | `HOST` | No | - | Bind address (http mode) | | `MCP_AUTH_DISABLE` | No (http) | - | Set to `1` to skip Bearer JWT verification when behind an external auth gateway | | `OUTLOOK_CLIENT_ID` | No | `d56f8c71-9f7c-43f4-9934-be29cb6e77b0` (bundled public client) | Override the bundled Azure AD public client for self-hosted Outlook OAuth2 (or `--client-id=` on `auth`, which overrides this env var) | | `OUTLOOK_EMAIL` | No | - | Workaround when Microsoft device-code response omits the email field | | `OUTLOOK_TENANT` | No | `consumers` (stdio/CLI), `common` (http device-code) | Microsoft directory to sign in against, used for **both** the device-code and the token-refresh endpoint. Set `common` for a work/school (Entra ID) mailbox, or a tenant GUID / verified domain to pin one directory | | `OUTLOOK_SCOPES` | No | `https://outlook.office.com/IMAP.AccessAsUser.All https://outlook.office.com/SMTP.Send offline_access` | Space-separated scope list. Narrow it (e.g. drop `SMTP.Send`) for a read-only deployment — a grant consented with fewer scopes cannot be refreshed against the full list | | `OUTLOOK_EXTRA_DOMAINS` | No | - | Comma-separated domains routed to OAuth in addition to `outlook.com`/`hotmail.com`/`live.com`. Needed for a Microsoft 365 mailbox on your own domain, which otherwise looks like a password account | ### Multiple Accounts ```bash EMAIL_CREDENTIALS=user1@gmail.com:pass1,user2@outlook.com:pass2,user3@yahoo.com:pass3 ``` ### Custom IMAP Host ```bash # Custom hostname (default port 993, implicit TLS) EMAIL_CREDENTIALS=user@custom.com:password:imap.custom.com # Custom hostname with a custom port EMAIL_CREDENTIALS=user@custom.com:password:imap.custom.com:1993 # Local IMAP proxy -- "localhost" is accepted as a host, even without a dot EMAIL_CREDENTIALS=user@custom.com:password:localhost:1993 ``` Each account can use its own host and port. A non-993 port is treated as plaintext/STARTTLS -- the usual shape for a local IMAP proxy (for example [email-oauth2-proxy](https://github.com/simonrob/email-oauth2-proxy)). ### Microsoft 365 work/school accounts A mailbox in a Microsoft 365 organisation -- including one on your own domain -- signs in through Entra ID rather than the consumer directory, and Microsoft disabled basic auth for Exchange Online in 2024, so an App Password is not an option. Two settings make it work: ```bash # Sign in against the directory that owns the mailbox OUTLOOK_TENANT=common # or a tenant GUID / verified domain # Route your own domain to OAuth instead of asking for a password OUTLOOK_EXTRA_DOMAINS=company.com ``` `OUTLOOK_TENANT` applies to the token refresh as well as the initial sign-in -- refreshing a work/school token against the consumer directory fails with `AADSTS7000012: The grant was obtained for a different tenant`. If the mailbox was consented with a narrower grant (say IMAP but no SMTP), match it with `OUTLOOK_SCOPES` so the refresh does not ask for more than was granted. ### Search Query Language | Query | Description | |:------|:------------| | `UNREAD` | Unread emails | | `FLAGGED` | Starred emails | | `SINCE 2024-01-01` | Emails after date | | `FROM boss@company.com` | Emails from sender | | `SUBJECT meeting` | Emails matching subject | | `UNREAD SINCE 2024-06-01` | Compound filter | ### Supported Providers | Provider | Auth | Save-to-Sent | |:---------|:-----|:-------------| | Gmail | App Password | Auto (skipped) | | Yahoo | App Password | Auto (skipped) | | iCloud/Me.com | App-Specific Password | Auto (skipped) | | Outlook/Hotmail/Live | OAuth2 (Device Code) | IMAP APPEND | | Zoho | App Password | IMAP APPEND | | ProtonMail | ProtonMail Bridge | IMAP APPEND | | Custom | Via `email:pass:imap.host` | IMAP APPEND | ## Security - **Credential sanitization** -- Passwords never leaked in error messages - **App Passwords** -- Uses app-specific passwords, not regular passwords - **Token storage** -- Outlook OAuth tokens saved with 600 permissions - **IMAP validation** -- Search queries validated before execution ## Build from Source ```bash git clone https://github.com/n24q02m/better-email-mcp.git cd better-email-mcp bun install bun run dev ``` ## Deploy to Cloudflare [![Deploy to Cloudflare](https://deploy.workers.cloudflare.com/button)](https://deploy.workers.cloudflare.com/?url=https://github.com/n24q02m/better-email-mcp) Run your own multi-user better-email instance serverless on Cloudflare (Containers + KV). Each JWT `sub` gets its own Container Durable Object, and every user's email credentials and Outlook OAuth tokens are AES-256-GCM encrypted into a single Workers KV blob per user, so they survive scale-to-zero / container recreate with no re-auth. **Prerequisites:** a Cloudflare account on the **Workers Paid plan** — required for Containers (the Cloudflare free tier does not include Containers) — and the `wrangler` CLI. 1. `git clone https://github.com/n24q02m/better-email-mcp && cd better-email-mcp` 2. `wrangler login` 3. Create the KV namespace (better-email is KV-only -- no D1 / Vectorize): ``` wrangler kv namespace create better-email-kv ``` Paste the returned id into `` in `wrangler.jsonc`. 4. Push the container image to your Cloudflare managed registry (CF Containers cannot pull from external registries directly), then set `` in `wrangler.jsonc`: ``` docker pull ghcr.io/n24q02m/better-email-mcp:beta docker tag ghcr.io/n24q02m/better-email-mcp:beta better-email-mcp:beta wrangler containers push better-email-mcp:beta # prints registry.cloudflare.com//better-email-mcp:beta ``` 5. Point `wrangler.jsonc` at your own domain: set `` (e.g. `https://email.example.com`) and `` (e.g. `email.example.com`). 6. Set the deploy secrets: ``` wrangler secret put CREDENTIAL_SECRET # per-sub vault key + deterministic EdDSA signing (required) wrangler secret put MCP_RELAY_PASSWORD # gate for the /authorize setup form wrangler secret put MCP_DCR_SERVER_SECRET # proof of an intentional multi-user deploy ``` Optional Outlook overrides -- only to replace the bundled public Azure device-code client (default needs no user-side Azure app): `wrangler secret put OUTLOOK_CLIENT_ID` and `wrangler secret put OUTLOOK_EMAIL`. For a Microsoft 365 organisation, also set `OUTLOOK_TENANT` (and `OUTLOOK_EXTRA_DOMAINS` for mailboxes on your own domain). 7. `wrangler deploy`, then open `/authorize` and complete the browser relay form. End-users supply their own email credentials -- an App Password via the paste form, or the bundled Outlook device-code sign-in -- through that relay form; there is no server-side `EMAIL_CREDENTIALS`. Storage maps to Cloudflare via `MCP_STORAGE_BACKEND=cf-kv` (already set in `wrangler.jsonc`); see [Cloudflare serverless mode (KV-only)](#cloudflare-serverless-mode-kv-only) for the encryption and trust details. ## Trust Model This plugin implements **TC-NearZK**. Storage durability depends on the deployment mode; see the [mcp-core trust model](https://mcp.n24q02m.com/servers/mcp-core/trust-model/) for full classification. | Mode | Storage | Encryption | Who can read your data? | |---|---|---|---| | HTTP remote (Cloudflare) | Encrypted Workers KV `subs//config` | AES-256-GCM | Server operator (admin = user) | | HTTP local Docker | Encrypted local files under `$HOME/.better-email-mcp/subs//config.json` | AES-256-GCM | Server operator (admin = user) | | stdio | platformdirs `mcp` config dir (`config.enc`; e.g. `%APPDATA%\mcp\Config\config.enc` on Windows) | AES-GCM, machine-bound key | Only your OS user (file perm 0600) | ## License Apache-2.0 -- See [LICENSE](https://github.com/n24q02m/better-email-mcp/blob/HEAD/LICENSE).