What is the MailStream remote MCP server?
The MailStream remote MCP server is a hosted Model Context Protocol endpoint at https://my.mailstream.app/mcp, so AI assistants can connect to it without installing or running anything locally.
MailStream MCP ServerVerifiedFeatured
@Sponge Labs
Basic information
Transport
Streamable HTTP
Authentication
OAuth
Category
Communication
Author
Sponge Labs
Submitted by
Jeff Kingsford
About MailStream MCP Server
The first MCP server for physical mail. Give any MCP-compatible AI agent the ability to send real postcards and letters, verify addresses, manage mailing lists and artwork, and track direct mail campaigns. Remote Streamable HTTP server with OAuth 2.1 sign-in (no API keys to paste) and 27 tools mirroring the MailStream REST API.
Connection details
https://my.mailstream.app/mcpSetup
claude mcp add mailstream --transport http https://my.mailstream.app/mcpMailStream MCP Server tools
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Overview
What is MailStream MCP?
MailStream is the first MCP server for physical mail. It gives any MCP-compatible AI agent (Claude, Cursor, VS Code, and more) the ability to send real postcards and letters, verify addresses, manage mailing lists and artwork, and track direct mail campaigns.
Key features
- Send physical mail: postcards (4x6, 6x9, 6x11), letters, and radius mailer campaigns around any location
- 27 tools mirroring the MailStream REST API v1
- Address management: create, verify, and organize addresses and mailing lists; import from CSV
- Artwork: supply designs by URL or HTML
- Campaign control: track and cancel campaigns before dispatch
- Built-in docs: searchable API documentation and product catalog exposed as MCP resources
Setup
Add to your MCP config:
{
"mcpServers": {
"mailstream": {
"url": "https://my.mailstream.app/mcp"
}
}
}
Or in Claude Code:
claude mcp add --transport http mailstream https://my.mailstream.app/mcp
Sign in with OAuth when prompted. No API keys to copy.
Links
Frequently asked questions
How do I connect to the MailStream MCP server?
Add the endpoint https://my.mailstream.app/mcp to any MCP-compatible client such as Claude Code, Cursor, or VS Code. The setup snippets on this page configure each client in one step.
Does the MailStream MCP server require authentication?
Yes. MailStream uses OAuth: the first time you connect, your MCP client opens a browser window to sign in and authorize access, then reuses the credentials for future sessions.
Which transport does the MailStream MCP server use?
MailStream exposes a Streamable HTTP endpoint, the transport used by remote MCP servers and supported by all major MCP clients.
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