PieterPost MCP for Claude
Send real mail from Claude.
PieterPost MCP connects Claude to your PieterPost tools. Claude can help prepare letters and postcards, look up safe account context, create checkout links, and use Mailbook contacts while you stay in control of every real send.
How we send the King of the Netherlands a letter with the PieterPost MCP x Claude
A small royal field test for the new AI-to-real-mail pipeline.
Add PieterPost in Claude
In Claude, add PieterPost as a custom connector and use this server URL:
https://pieterpost.com/mcp/
- 1Open Claude settings and go to Connections.
- 2Choose Add custom connector.
- 3Name it PieterPost and paste the server URL.
- 4Click Add, then Connect, and approve PieterPost when the browser opens.
Once PieterPost appears in Claude Connections, click Connect to start the OAuth approval flow.
What Claude can do with PieterPost
MCP gives Claude a controlled set of PieterPost tools. It is useful when you want the conversation and the mail workflow to live in one place.
Compose links
Ask Claude to draft a letter or postcard and create a secure PieterPost compose link.
Hosted checkout
Let the sender review the mail and pay in PieterPost checkout before anything is printed.
Mailbook
Use saved contacts, address requests, and recipient details from your PieterPost Mailbook.
Direct send
For trusted workflows, quote and send directly with API credits after explicit confirmation.
Safety and permissions
PieterPost uses OAuth, so Claude asks you to connect your PieterPost account before it can use account-specific tools. Live direct sends spend real credits and send real mail, so those actions require clear confirmation before they happen.
