JMAP Email

Name: JMAP Email
Author: mikluko

by miklukoversion 0.10.0i★ –iRuns on your computer

Registry nameio.github.mikluko/jmap-mcp

Install

Overview

Description from the maker (original English)

Email management via JMAP — mailboxes, messages, identities, and Sieve scripts

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Chat & email
You need to fill in: JMAP_SESSION_URL, JMAP_AUTH_TOKEN

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: JMAP_SESSION_URL, JMAP_AUTH_TOKEN

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

DockerDocker installed

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "jmap": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "JMAP_SESSION_URL",
        "-e",
        "JMAP_AUTH_TOKEN",
        "ghcr.io/mikluko/jmap-mcp:0.10.0"
      ],
      "env": {
        "JMAP_SESSION_URL": "your-value",
        "JMAP_AUTH_TOKEN": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add jmap --env JMAP_SESSION_URL=your-value --env JMAP_AUTH_TOKEN=your-value -- docker run -i --rm -e JMAP_SESSION_URL -e JMAP_AUTH_TOKEN ghcr.io/mikluko/jmap-mcp:0.10.0

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "jmap": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "JMAP_SESSION_URL",
        "-e",
        "JMAP_AUTH_TOKEN",
        "ghcr.io/mikluko/jmap-mcp:0.10.0"
      ],
      "env": {
        "JMAP_SESSION_URL": "your-value",
        "JMAP_AUTH_TOKEN": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "jmap": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "-e",
        "JMAP_SESSION_URL",
        "-e",
        "JMAP_AUTH_TOKEN",
        "ghcr.io/mikluko/jmap-mcp:0.10.0"
      ],
      "env": {
        "JMAP_SESSION_URL": "your-value",
        "JMAP_AUTH_TOKEN": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

JMAP_SESSION_URL required env
JMAP session endpoint URL (e.g. https://api.fastmail.com/jmap/session)
JMAP_AUTH_TOKEN secret required env
JMAP bearer token for authentication

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account mikluko, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Chat & emaili

More stars than 0% of the other 1774 servers in this category
Published to the registry more recently than 3% of the other 1774 servers in this category
Basic checks equal to or better than 100% of the other 1774 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is JMAP Email safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: JMAP_SESSION_URL, JMAP_AUTH_TOKEN

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.10.0) reached the registry 9 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Docker on your computer.

What can I use instead?

In the same category: Vexa, emailmd, MCP WhatsApp Cloud

Alternatives

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Runs in the cloud★ 2,949Apache-2.0Updated 2 months ago

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emailmd

by anypost

Render markdown into email-safe HTML, lint drafts for deliverability problems, and preview emails.

Computer or cloud★ 1,385MITUpdated 31 days ago

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MCP WhatsApp Cloud

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MCP server for WhatsApp Cloud API (Meta) — messages, media, and templates via Graph API

Runs on your computer★ 277MITUpdated 5 months ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

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)

Tool	JMAP Method	Description
`email_query`	`Email/query`	Search emails with filters, returns IDs and total count
`email_get`	`Email/get`	Get full content of emails by ID
`email_create`	`Email/set`	Create a new email draft in the Drafts mailbox
`email_move`	`Email/set`	Move emails to a different mailbox
`email_flag`	`Email/set`	Set or remove flags (seen, flagged, answered, draft)
`email_delete`	`Email/set`	Delete emails (move to Trash or permanently destroy)
`email_attachment_url`	Blob download	Signed URL streaming an attachment, expires in 30 s (HTTP mode only)

Identity

Tool	JMAP Method	Description
`identity_get`	`Identity/get`	List sender identities (email addresses)

Submission (feature-gated)

Tool	JMAP Method	Description
`email_submission_set`	`EmailSubmission/set`	Submit a draft for delivery (requires `-enable-send`)

Sieve Scripts (RFC 9661, feature-gated)

Tool	JMAP Method	Description
`sieve_get`	`SieveScript/get`	List all scripts, or get one with full content (requires `-enable-sieve`)
`sieve_set`	`SieveScript/set`	Create, update, or destroy Sieve scripts (requires `-enable-sieve`)
`sieve_validate`	`SieveScript/validate`	Validate a Sieve script without saving (requires `-enable-sieve`)

Configuration

Env var	Required	Description
`JMAP_SESSION_URL`	always	JMAP session endpoint (e.g. `https://api.fastmail.com/jmap/session`)
`JMAP_AUTH_TOKEN`	stdio mode	Bearer token for JMAP authentication
`ATTACHMENT_URL_SECRET`	no	Secret sealing signed attachment URLs; set for multi-replica deployments (default: random per-process key)

Flag	Default	Description
`-mode`	`stdio`	Server mode: `stdio` or `http`
`-listen`	`:8080`	HTTP listen address (http mode only)
`-enable-send`	`false`	Enable the `email_submission_set` tool (off by default)
`-enable-sieve`	`false`	Enable Sieve script tools (off by default, requires JMAP server support)
`-external-url`	derived	External base URL for signed attachment links; default derives from the request (`X-Forwarded-Proto`/`X-Forwarded-Host` aware)

In HTTP mode, the token can be passed per-request via Authorization: Bearer header or jmap_token query parameter (query parameter takes precedence).

In HTTP mode, email_attachment_url returns a link served from /attachments/ that expires 30 seconds after issuance. The link is an AES-GCM sealed capability: it embeds the JMAP token, account, and blob IDs, so the endpoint streams the attachment from the JMAP server without any additional authentication and stores nothing on disk.

Installation

Kubernetes (Helm)

helm install jmap-mcp oci://sarak.sh/mikluko/charts/jmap-mcp \

--version \ --set jmap.sessionURL="https://api.fastmail.com/jmap/session"

In HTTP mode, JMAP auth tokens are passed per-request via Authorization: Bearer header or ?jmap_token= query parameter — no static tokens are stored in the cluster.

The image is sarak.sh/mikluko/jmap-mcp: .

Debian package

Releases publish .deb packages for amd64 and arm64 to the sarak.sh Debian registry, distribution trixie, component main, and attach them to the release.

Types: deb

URIs: https://sarak.sh/api/packages/mikluko/debian Suites: trixie Components: main Signed-By: /etc/apt/keyrings/sarak.asc

The key is at https://sarak.sh/api/packages/mikluko/debian/repository.key.

Binary

go install sarak.sh/mikluko/jmap-mcp@latest

From source

git clone https://sarak.sh/mikluko/jmap-mcp.git

cd jmap-mcp make install

Usage

# stdio mode (default)

export JMAP_SESSION_URL=https://api.fastmail.com/jmap/session export JMAP_AUTH_TOKEN=your-token ./jmap-mcp

HTTP mode

./jmap-mcp -mode http -listen :8080

Build

make build # Build and push container image + Helm chart

make image # Build and push container image with ko make package # Package and push Helm chart to OCI registry make test # Run tests make install # Install binary locally

References

RFC 8620 — JMAP Core
RFC 8621 — JMAP Mail
RFC 9425 — JMAP Sieve Scripts
MCP Specification

JMAP Email

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Chat & emaili

Common questions

Alternatives

Vexa

emailmd

MCP WhatsApp Cloud

README from the maker

jmap-mcp

Tools

Mailbox (RFC 8621)

Email (RFC 8621)

Identity

Submission (feature-gated)

Sieve Scripts (RFC 9661, feature-gated)

Configuration

Installation

Kubernetes (Helm)

Debian package

Binary

From source

Usage

HTTP mode

Build

References