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JMAP Email

mikluko/jmap-mcp

A JMAP protocol wrapper that gives you programmatic access to email operations like querying, moving, flagging, and deleting messages, plus mailbox management and Sieve script editing. Built on the Go MCP SDK and talks to any JMAP-compatible server (Fastmail, Cyrus, etc). You get tight mappings to JMAP methods from RFC 8621, so email_query hits Email/query, email_set handles mutations, and mailbox operations work as you'd expect. Email sending and Sieve tools are gated behind flags since they're higher risk. Runs in stdio mode for local use or HTTP mode for shared deployments, with per-request auth tokens in the latter. Reach for this when you need Claude to interact with JMAP mail providers directly instead of fumbling with IMAP.

GitHub stars: 1
tools: 14
auth: Secret needed
transport: STDIO
env vars: 2
last updated: Feb 19, 2026

Tools

14 tools

Public tool metadata for what this MCP can expose to an agent.

mailbox_getGet mailboxes by ID, or list all

Get mailboxes by ID, or list all

No parameter schema in public metadata yet.

mailbox_setCreate, update, or destroy mailboxes

Create, update, or destroy mailboxes

No parameter schema in public metadata yet.

email_querySearch emails with filters, returns IDs and total count

Search emails with filters, returns IDs and total count

No parameter schema in public metadata yet.

email_getGet full content of emails by ID

Get full content of emails by ID

No parameter schema in public metadata yet.

email_createCreate a new email draft in the Drafts mailbox

Create a new email draft in the Drafts mailbox

No parameter schema in public metadata yet.

email_moveMove emails to a different mailbox

Move emails to a different mailbox

No parameter schema in public metadata yet.

email_flagSet or remove flags (seen, flagged, answered, draft)

Set or remove flags (seen, flagged, answered, draft)

No parameter schema in public metadata yet.

email_deleteDelete emails (move to Trash or permanently destroy)

Delete emails (move to Trash or permanently destroy)

No parameter schema in public metadata yet.

email_attachment_urlSigned URL streaming an attachment, expires in 30 s (HTTP mode only)

Signed URL streaming an attachment, expires in 30 s (HTTP mode only)

No parameter schema in public metadata yet.

identity_getList sender identities (email addresses)

List sender identities (email addresses)

No parameter schema in public metadata yet.

email_submission_setSubmit a draft for delivery (requires -enable-send)

Submit a draft for delivery (requires -enable-send)

No parameter schema in public metadata yet.

sieve_getList all scripts, or get one with full content (requires -enable-sieve)

List all scripts, or get one with full content (requires -enable-sieve)

No parameter schema in public metadata yet.

sieve_setCreate, update, or destroy Sieve scripts (requires -enable-sieve)

Create, update, or destroy Sieve scripts (requires -enable-sieve)

No parameter schema in public metadata yet.

sieve_validateValidate a Sieve script without saving (requires -enable-sieve)

Validate a Sieve script without saving (requires -enable-sieve)

No parameter schema in public metadata yet.

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Configuration

JMAP_SESSION_URL*

JMAP session endpoint URL (e.g. https://api.fastmail.com/jmap/session)

JMAP_AUTH_TOKEN*secret

JMAP bearer token for authentication

Readme

jmap-mcp

MCP server exposing JMAP email and Sieve script operations as tools.

Built with the Go MCP SDK (go-sdk) and jmap library.

Tools

Tools map closely to JMAP methods. Email mutation tools provide structured convenience wrappers over Email/set patches.

Mailbox (RFC 8621)

Tool	JMAP Method	Description
`mailbox_get`	`Mailbox/get`	Get mailboxes by ID, or list all
`mailbox_set`	`Mailbox/set`	Create, update, or destroy mailboxes

Email (RFC 8621)

View the full README on GitHub

Details

Repository: github.com/mikluko/jmap-mcp
Category: Communication & Messaging
Package: ghcr.io/mikluko/jmap-mcp:0.10.0
Transport: STDIO
Auth: Required
Registry: MCP registry, active

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