Sendmux Sdk vs Winnr

In-depth architectural comparison of the Sendmux Sdk and Winnr MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Sendmux Sdk when:

• You need dedicated capabilities in the Communication domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: OAuth 2.0 (Freemium).
• Primary tools included: Receive email, Search mailboxes, Send email.

Explore Sendmux Sdk Details

W

Choose Winnr when:

• You need dedicated capabilities in the Communication domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• You have access to required keys: WINNR_API_TOKEN.
• Primary tools included: winnr_get_account, winnr_get_usage, winnr_list_jobs.

Explore Winnr Details

Feature & Specification Comparison

Specification	Sendmux Sdk Sendmux Communication	W Winnr Communication
Summary	Email inbox API MCP server for AI agents to receive, search, and send mail through hosted or local Sendmux Product MCP.	Cold email infrastructure: buy domains, create SMTP mailboxes, set DNS, run warming, read mail.
Category & Scope	Communication	Communication

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "sendmux-sendmux-sdk": {
      "command": "uvx",
      "args": [
        "sendmux-core"
      ]
    }
  }
}

{
  "mcpServers": {
    "winnr": {
      "command": "uvx",
      "args": [
        "winnr-mcp"
      ],
      "env": {
        "WINNR_API_TOKEN": "YOUR_WINNR_API_TOKEN_HERE"
      }
    }
  }
}

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