How do I authenticate this MCP server with MultiMail?

Set the MULTIMAIL_API_KEY environment variable to your API key (starting with mm_live_). Optionally set MULTIMAIL_MAILBOX_ID to avoid passing mailbox_id to each tool call. If not set, call list_mailboxes first to retrieve available mailbox IDs.

Can I use this server with multiple email accounts?

Yes. If you don't set MULTIMAIL_MAILBOX_ID, you can pass mailbox_id to each tool or call list_mailboxes to see all available mailboxes and select one per request.

What does 'human oversight' mean in the context of this server?

The registry description emphasizes human oversight, meaning the server is designed for workflows where AI agents draft or compose emails but humans review and approve before sending. Check the MultiMail documentation for specific oversight features.

Does this server support attachments?

The registry metadata does not specify attachment support. Refer to the MultiMail API documentation or test with your API key to confirm attachment capabilities.

What is the pricing model for this MCP server?

This MCP server is a wrapper around the MultiMail API. Pricing depends on your MultiMail plan. Visit multimail.dev or your MultiMail dashboard for current pricing details.

MCP ServerSTDIOOfficialv0.1.5

Multimail MCP Server

Send and receive emails as markdown through AI agents with built-in human oversight. For developers integrating email workflows into Claude or other LLM applications via the MultiMail API.

dev.multimail/mcp-server

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Hosted URL

Local install

Transport

STDIO

Auth

1 required env var

What the Multimail MCP server does

How models use it and what it is built for.

Send and receive emails as markdown through AI agents with built-in human oversight. For developers integrating email workflows into Claude or other LLM applications via the MultiMail API.

Connect to Multimail

Local install — runs as a subprocess.

npx @multimail/mcp-server@0.1.5

Environment variables

Configuration this server reads at startup.

MULTIMAIL_API_KEYRequiredSecret
Your MultiMail API key (starts with mm_live_)
MULTIMAIL_MAILBOX_ID
Default mailbox ID. If not set, pass mailbox_id to each tool or call list_mailboxes first.

Resources

Where to find authoritative docs and source for Multimail.

Source repository

Example prompts for Multimail

Paste any of these into Agent Studio after connecting Multimail.

List all mailboxes available in my MultiMail account
Fetch unread emails from my default mailbox and format as markdown
Draft an email response to the latest message, then send it
What authentication is required to connect this MCP server to my MultiMail account?

Multimail MCP server — FAQ

Common questions about connecting and running Multimail.

How do I authenticate this MCP server with MultiMail?
Set the MULTIMAIL_API_KEY environment variable to your API key (starting with mm_live_). Optionally set MULTIMAIL_MAILBOX_ID to avoid passing mailbox_id to each tool call. If not set, call list_mailboxes first to retrieve available mailbox IDs.
Can I use this server with multiple email accounts?
Yes. If you don't set MULTIMAIL_MAILBOX_ID, you can pass mailbox_id to each tool or call list_mailboxes to see all available mailboxes and select one per request.
What does 'human oversight' mean in the context of this server?
The registry description emphasizes human oversight, meaning the server is designed for workflows where AI agents draft or compose emails but humans review and approve before sending. Check the MultiMail documentation for specific oversight features.
Does this server support attachments?
The registry metadata does not specify attachment support. Refer to the MultiMail API documentation or test with your API key to confirm attachment capabilities.
What is the pricing model for this MCP server?
This MCP server is a wrapper around the MultiMail API. Pricing depends on your MultiMail plan. Visit multimail.dev or your MultiMail dashboard for current pricing details.

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