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mcp/harbor
Verified official

MailStream MCP

v1.0.0

app.mailstream/mailstream

The first MCP server for physical mail: send postcards and letters, manage lists and campaigns.

transport:streamable-http
Website

Target client

run in your project directory 

claude mcp add --transport http mailstream https://my.mailstream.app/mcp

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs

This listing does not declare its tools. Connect the server and your client will discover them on the handshake.