pyfastmail-mcp
About
MCP server for Fastmail — email, contacts, calendars, and files via JMAP, CardDAV, CalDAV, and WebDAV
Details
- Author
- pjosols
- Categories
- Communication, Automation, Other, Productivity
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Setup
Install pyfastmail-mcp in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/pjosols/pyfastmail-mcp
Follow the installation instructions in the repository README, then restart your MCP client.
⚠️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.
You need an API token from Fastmail. An app password is optional (only needed for calendar and file storage).
- API Token(required — mail and contacts):Fastmail Settings → Privacy & Security → API Tokens— enable theurn:ietf:params:jmap:contactscapability
- App Password(optional — calendars and files):Fastmail Settings → Privacy & Security → App Passwords— create one with the"DAV (CardDAV, CalDAV, WebDAV)"scope
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.
export FASTMAIL_API_TOKEN="fmu1-..." export FASTMAIL_APP_PASSWORD="your-app-password" export FASTMAIL_EMAIL="you@fastmail.com"
For Claude Desktop, add toclaude_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}" } } } }
git clone https://github.com/pjosols/pyfastmail-mcp.git cd pyfastmail-mcp uv sync --group dev uv run pytest
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