MCP server for Open-Xchange: email (IMAP/SMTP), Sieve filters, CalDAV calendar, CardDAV contacts
To add ox-mcp to Claude, run the install command below or copy the ready-made config for Claude Code, Claude Desktop, Cursor and VS Code further down. Restart your client after adding it and its tools show up in your next conversation. It needs 9 environment variables, listed below.
Install
npx -y @rheopyrin/ox-mcp@0.1.4Environment variables
OX_MCP_MAIL_SERVERSet in your MCP configOX_MCP_MAIL_USERSet in your MCP configOX_MCP_MAIL_APP_PASSWORDSet in your MCP configOX_MCP_CALDAV_SERVERSet in your MCP configOX_MCP_CALDAV_USERSet in your MCP configOX_MCP_CALDAV_APP_PASSWORDSet in your MCP configOX_MCP_CARDDAV_SERVERSet in your MCP configOX_MCP_CARDDAV_USERSet in your MCP configOX_MCP_CARDDAV_APP_PASSWORDSet in your MCP configInstall with your client
claude mcp add ox --env OX_MCP_MAIL_SERVER=<YOUR_OX_MCP_MAIL_SERVER> --env OX_MCP_MAIL_USER=<YOUR_OX_MCP_MAIL_USER> --env OX_MCP_MAIL_APP_PASSWORD=<YOUR_OX_MCP_MAIL_APP_PASSWORD> --env OX_MCP_CALDAV_SERVER=<YOUR_OX_MCP_CALDAV_SERVER> --env OX_MCP_CALDAV_USER=<YOUR_OX_MCP_CALDAV_USER> --env OX_MCP_CALDAV_APP_PASSWORD=<YOUR_OX_MCP_CALDAV_APP_PASSWORD> --env OX_MCP_CARDDAV_SERVER=<YOUR_OX_MCP_CARDDAV_SERVER> --env OX_MCP_CARDDAV_USER=<YOUR_OX_MCP_CARDDAV_USER> --env OX_MCP_CARDDAV_APP_PASSWORD=<YOUR_OX_MCP_CARDDAV_APP_PASSWORD> -- npx -y @rheopyrin/ox-mcp@0.1.4
Run this in a terminal to add the server to Claude Code.
What this does
ox-mcp exposes a set of tools to Claude over the Model Context Protocol. After you add it to claude_desktop_config.json (snippet above) and restart Claude Desktop, those tools become callable inside any conversation.
Requirements
This server needs the following environment variables to be set before it can run:
OX_MCP_MAIL_SERVER OX_MCP_MAIL_USER OX_MCP_MAIL_APP_PASSWORD OX_MCP_CALDAV_SERVER OX_MCP_CALDAV_USER OX_MCP_CALDAV_APP_PASSWORD OX_MCP_CARDDAV_SERVER OX_MCP_CARDDAV_USER OX_MCP_CARDDAV_APP_PASSWORD
Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).
Frequently asked questions
How do I install ox-mcp?
Run the Claude Code command in the install section to add ox-mcp to Claude Code, or copy the ready-made config for your client from the install section on this page. Restart your client afterwards and the tools appear in your next conversation.
Which clients work with ox-mcp?
This page carries setup and config for Claude Code, Claude Desktop, Cursor and VS Code. Any other MCP client that accepts a standard server config can connect to ox-mcp as well.
Does ox-mcp need an API key?
Yes. Before it can run, set these environment variables: OX_MCP_MAIL_SERVER, OX_MCP_MAIL_USER, OX_MCP_MAIL_APP_PASSWORD, OX_MCP_CALDAV_SERVER, OX_MCP_CALDAV_USER, OX_MCP_CALDAV_APP_PASSWORD, OX_MCP_CARDDAV_SERVER, OX_MCP_CARDDAV_USER, OX_MCP_CARDDAV_APP_PASSWORD. They go in the env block of your MCP config.
Imported from the Official MCP Registry. The details above come from the registry entry; the maker can claim this listing to correct them, add docs, and see its traffic.
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