Proof Inbox vs Agent Cold Email

In-depth architectural comparison of the Proof Inbox and Agent Cold Email 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?

P

Choose Proof Inbox 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: balance, verify_email, receipts.

Explore Proof Inbox Details

Choose Agent Cold Email 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 Agent Cold Email Details

Feature & Specification Comparison

Specification	P Proof Inbox Communication	Agent Cold Email Communication
Summary	Prepaid email-verify credits for MCP agents via Stripe Link.	Agent-native cold-email infrastructure: domains, mailboxes, warmup, sequences, replies via 17 tools
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": {
    "proof-inbox-2": {
      "url": "https://proofinbox.com"
    }
  }
}

{
  "mcpServers": {
    "agent-cold-email": {
      "command": "npx",
      "args": [
        "-y",
        "skills"
      ]
    }
  }
}

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