Sendmux MCP vs Smails

In-depth architectural comparison of the Sendmux MCP and Smails 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 MCP 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).

Explore Sendmux MCP Details

Choose Smails 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).

Explore Smails Details

Feature & Specification Comparison

Specification	Sendmux MCP Communication	Smails Communication
Summary	Email inbox API for AI agents with MCP tools for Mailbox, Management, and Sending APIs.	Disposable email for AI agents: create a throwaway inbox and read verification emails over MCP.
Category & Scope	Communication	Communication
Quality signal

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

{
  "mcpServers": {
    "smails": {
      "command": "npx",
      "args": [
        "-y",
        "@smails/cli"
      ]
    }
  }
}

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