Multimail Dev MCP Server

Your agent doesn't have email yet because nobody trusts it with email yet. MultiMail fixes that. A real email address with a trust ladder from read-only to fully autonomous, cryptographic identity on every message, and per-recipient sending controls. Its 40 documented tools cover email, account, mailbox, allowlist.

People connecting email tools to Claude, Cursor, VS Code, or another MCP client. The project is written in JavaScript.

VERIFIED ACTIVE

LAST COMMIT 2026-06-12 · ★ 2 · #37 OF 75 MAINTAINED EMAIL · VERIFIED 2026-08-25

MIT · JavaScript servers · how we verify → /methodology

01 · Install Multimail Dev MCP Server

before you install - you'll need

Set MULTIMAIL_API_KEY before connecting. MULTIMAIL_MAILBOX_ID is optional or environment-specific per the README.

Claude Code

claude mcp add multimail-dev-mcp-server --transport http https://mcp.multimail.dev/mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "multimail-dev-mcp-server": {
      "url": "https://mcp.multimail.dev/mcp"
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://mcp.multimail.dev/mcp

transport: streamable-http

endpoint alive - authentication required · probed 2026-08-25

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions · remote - your agent's requests go to mcp.multimail.dev

endpoint auth requires authentication - rejected our unauthenticated MCP initialize

license MIT - declared in the repository

npm package @multimail/mcp-server - the @multimail scope differs from the repo owner (multimail-dev); confirm it's the project's official package

registry vendor namespace dev.multimail - domain-verified with the official MCP registry

03 · What Multimail Dev MCP Server can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

With this server connected, an agent can send email as markdown. Supports attachments, idempotency_key, scheduled delivery via send_at, list emails with filters: status, sender, subject, date range, direction, attachments, pagination, download attachment as base64 with content type, and cancel a pending or scheduled email.

Capability map

Tools grouped from the project's README - what Multimail Dev MCP Server lets an agent do.

6 tools - e.g. Send email as markdown. Supports attachments, idempotency_key, scheduled delivery via send_at.; Full email content. Trusted metadata and untrusted body returned as separate content blocks.; Reply…

send_email · read_email · reply_email · edit_scheduled_email · wait_for_email · decide_email

read & search

6 tools - e.g. All emails in a conversation thread with participants and metadata.; Emails awaiting oversight decision (requires oversight scope).; All mailboxes with ID, address, oversight mode, display name.

get_thread · list_pending · list_mailboxes · get_usage · get_billing_portal · get_audit_log

Account

5 tools - e.g. Account status, plan, quota, sending enabled, enforcement tier.; Update org name, oversight email, physical address.; Permanently delete account and all data (admin scope).

get_account · update_account · delete_account · create_account · activate_account

Mailbox

4 tools - e.g. First-run setup: oversight mode, display name, CC/BCC, scheduling, signature.; Update settings (display name, oversight mode, signature, webhooks).; Create mailbox (admin scope + operator approval).

configure_mailbox · update_mailbox · create_mailbox · delete_mailbox

delete

3 tools - e.g. Cancel a pending or scheduled email.; Delete a specific tag key from an email.; Cancel paid subscription, revert to starter at period end.

cancel_message · delete_tag · cancel_subscription

Allowlist

3 tools - e.g. List sending allowlist entries.; Add a recipient to the sending allowlist. Operator approval required.; Remove an allowlist entry.

list_allowlist · add_allowlist_entry · remove_allowlist_entry

Api

3 tools - e.g. List all API keys (admin scope).; Create API key with scopes (admin + operator approval). send+oversight rejected to prevent self-approval.; Revoke an API key (admin scope).

list_api_keys · create_api_key · revoke_api_key

04 · Who maintains Multimail Dev MCP Server

mcp-server is maintained by multimail-dev. It's the only MCP server we track from this author; the repo dates to Feb 2026.

05 · Facts

repository: github.com/multimail-dev/mcp-server
category: email - ranked #37 of 75 actively-maintained email servers as of 2026-08-25.
registry: dev.multimail/mcp-server (active, first published 2026-02-22 · 3 versions)
packages: npm:@multimail/mcp-server

06 · Multimail Dev MCP Server FAQ

Is Multimail Dev MCP Server still maintained?

Yes - as of 2026-08-25, its last commit was 2026-06-12. We re-verify nightly.

What can Multimail Dev MCP Server do?

How do I install Multimail Dev MCP Server?

Run `npx -y @multimail/mcp-server`. The README documents 2 environment variables (MULTIMAIL_API_KEY, MULTIMAIL_MAILBOX_ID) to set first. Set MULTIMAIL_API_KEY before connecting. MULTIMAIL_MAILBOX_ID is optional or environment-specific per the README. You can also paste the ready-made client config above.

Does Multimail Dev MCP Server require authentication?

Yes - when we probed the endpoint on 2026-08-25, it rejected an unauthenticated MCP initialize; you'll need credentials to connect.

07 · Alternatives to Multimail Dev MCP Server

Alternatives to Multimail Dev MCP Server

Maintained email servers if Multimail Dev MCP Server isn't the fit.

More email MCP servers · Better Email MCP · Clippy · Maket · Imap MCP Server · Nitrosend

More JavaScript MCP servers · Reddit MCP Server (mypracticaltools) · aikstockdata - Korean Stock Data · Pickanagency · Socialclaw · Chromeflow · see all