# MailStream Muse connector

From musedirectory.ai, the independent directory of Meta Muse connectors. Not affiliated with Meta.

## MailStream

Send postcards and letters, manage mailing lists and campaigns from Muse

- Record: https://musedirectory.ai/connector/mailstream
- Category: Marketing & Ads
- Developer: MailStream (https://mailstream.app/developers/mcp-server)
- Muse status: Extra setup. Not in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
- Health: Working, sign-in needed, 411ms, checked 2026-09-28T08:00:55Z
- Endpoint: https://my.mailstream.app/mcp
- Auth: Sign in with your account; Pricing: unknown
- Screening: Screened, no issues found (2026-09-24T08:10:42Z)
- Source: Found in the official MCP Registry (app.mailstream/mailstream) https://registry.modelcontextprotocol.io/v0/servers?search=app.mailstream%2Fmailstream

Connects to MailStream to send physical postcards and letters, manage recipient lists, and run direct mail campaigns. Muse can help compose and schedule mail pieces and track campaign performance.

Example request: "Send a postcard to my top 50 customers announcing our holiday sale"

How to connect: MailStream is not in Muse's Connectors list yet, and it needs you to sign in with your MailStream account. Apps that need this kind of sign-in usually cannot be used from a Muse chat yet. Follow it here and we will tell you when it reaches Muse.

Screening checks:
- MCP handshake: pass (Requires sign-in (publishes OAuth metadata))
- Domain against threat feeds (Cloudflare security DNS): pass (my.mailstream.app, mailstream.app not flagged)
- Published packages against the OSV malicious-package database: n/a (No npm or PyPI package published)
- Hidden instructions or invisible characters in tool text: n/a (Tools are behind sign-in)
- Inputs asking for passwords, card numbers or seed phrases: n/a (Tools are behind sign-in)
- Domain and redirects: pass (Domain registered 561 days ago)
- AI review of purpose and tool behavior: pass (No concerns)