MCP Apollo vs Mail Index

In-depth architectural comparison of the MCP Apollo and Mail Index 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 MCP Apollo when:

• You need dedicated capabilities in the Communication domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: apollo_search_people, apollo_enrich_person, apollo_search_companies.

Explore MCP Apollo Details

Choose Mail Index 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 Mail Index Details

Feature & Specification Comparison

Specification	MCP Apollo Communication	Mail Index Communication
Summary	Apollo.io MCP server. Search people, enrich contacts, find emails, research companies.	Local-first, read-only MCP server for recall over your Gmail: search, contacts, threads, digests.
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": {
    "mcp-apollo": {
      "url": "https://YOUR_WORKER_URL/mcp"
    }
  }
}

{
  "mcpServers": {
    "mail-index-2": {
      "command": "npx",
      "args": [
        "-y",
        "-p",
        "mail-index",
        "mail-index-mcp"
      ]
    }
  }
}

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