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pyfastmail-mcp

by pjosols
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Python
Remote

pyfastmail-mcp

An MCP server that gives AI assistants full access to your Fastmail account — email, contacts, calendars, and file storage.

⚠️ This server can send email, delete messages, and modify contacts/calendars on your behalf. AI assistants may act on content from untrusted sources (emails, web pages, files) which could contain prompt injection attacks. Review tool calls before approving them, especially actions that send email or delete data.

Features

Domain

Protocol

Tools

Mail

JMAP

Send, reply, forward, search, read, pin, archive, keywords, masked email, attachments, threads, import/export, identities

Contacts

JMAP

List address books, CRUD contacts, query

Calendar

CalDAV

List calendars, CRUD events (optional — requires app password)

Files

WebDAV

List, upload, download, move, delete, create folders (optional — requires app password)

Related MCP server: FastMail MCP Server

Installation

pip install pyfastmail-mcp

Or run directly with uvx:

uvx pyfastmail-mcp

Configuration

1. Get Fastmail Credentials

You need an API token from Fastmail. An app password is optional (only needed for calendar and file storage).

If you only set the API token, the server starts with mail and contacts tools. Calendar and file tools are registered only when the app password is also provided.

2. Set Environment Variables

export FASTMAIL_API_TOKEN="fmu1-..."
export FASTMAIL_APP_PASSWORD="your-app-password"
export FASTMAIL_EMAIL="you@fastmail.com"

3. Add to Your MCP Client

For Claude Desktop, add to claude_desktop_config.json:

{
  "mcpServers": {
    "fastmail": {
      "command": "uvx",
      "args": ["pyfastmail-mcp"],
      "env": {
        "FASTMAIL_API_TOKEN": "fmu1-...",
        "FASTMAIL_APP_PASSWORD": "your-app-password",
        "FASTMAIL_EMAIL": "you@fastmail.com"
      }
    }
  }
}

For Kiro CLI, add to .kiro/settings/mcp.json:

{
  "mcpServers": {
    "fastmail": {
      "command": "uvx",
      "args": ["pyfastmail-mcp"],
      "env": {
        "FASTMAIL_API_TOKEN": "${FASTMAIL_API_TOKEN}",
        "FASTMAIL_EMAIL": "${FASTMAIL_EMAIL}",
        "FASTMAIL_APP_PASSWORD": "${FASTMAIL_APP_PASSWORD}"
      }
    }
  }
}

Tools

Mail (mail_*)

Tool

Description

health_check

Verify connection and auth

mail_list_mailboxes

List all mailboxes (folders/labels)

mail_create_mailbox

Create a mailbox

mail_rename_mailbox

Rename a mailbox

mail_delete_mailbox

Delete a mailbox

mail_get_email

Get email by ID (with optional headers)

mail_get_recent_emails

Get recent emails

mail_search_emails

Search by query

mail_search_snippets

Highlighted search result snippets

mail_get_email_thread

Get full thread

mail_mark_email_read

Mark read/unread

mail_pin_email

Pin/unpin (flag/star)

mail_move_email

Move to mailbox

mail_delete_email

Move to trash or permanently delete

mail_archive_email

Archive

mail_manage_email_labels

Add/remove keywords

mail_export_email

Download raw .eml file

mail_import_email

Import .eml into mail store

mail_parse_email

Parse a blob as email without importing

mail_list_identities

List send-as identities

mail_set_identity

Create/update/delete identities

mail_send_email

Send new email

mail_reply_to_email

Reply to email

mail_forward_email

Forward email

mail_list_masked_emails

List masked emails

mail_create_masked_email

Create masked email

mail_update_masked_email

Update masked email state, domain, description, or URL

mail_download_attachment

Download attachment

mail_upload_attachment

Upload blob for sending

Contacts (contacts_*)

Tool

Description

contacts_list_address_books

List address books

contacts_list

List contacts (query+get combo)

contacts_get_contact

Get contact(s) by ID

contacts_query_contacts

Query contacts with filters and sorting

contacts_create_contact

Create contact

contacts_update_contact

Update contact fields

contacts_delete_contact

Delete contact(s)

Calendar (calendar_*)

Tool

Description

calendar_list_calendars

List calendars

calendar_list_events

List events

calendar_get_event

Get event details

calendar_create_event

Create event

calendar_update_event

Update event

calendar_delete_event

Delete event

Files (files_*)

Tool

Description

files_list

List files/folders

files_get

Download file

files_upload

Upload file

files_create_folder

Create folder

files_move

Move/rename file

files_delete

Delete file/folder

Development

git clone https://github.com/pjosols/pyfastmail-mcp.git
cd pyfastmail-mcp
uv sync --group dev
uv run pytest

License

MIT

Install Server
A
license - permissive license
A
quality
B
maintenance

How are these scores calculated?

Maintenance

–Maintainers
–Response time
3dRelease cycle
6Releases (12mo)
Commit activity

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Tools

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