Inbox Preview vs Email Spam Tester

In-depth architectural comparison of the Inbox Preview and Email Spam Tester 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?

I

Choose Inbox Preview 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 Inbox Preview Details

Choose Email Spam Tester 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).

Explore Email Spam Tester Details

Feature & Specification Comparison

Specification	I Inbox Preview Communication	Email Spam Tester VerifiedCommunication
Summary	Render HTML/.eml emails in real Gmail, Outlook & Yahoo web clients and screenshot them	Email deliverability testing for agents. Four tools: get a disposable test address, wait for the report once the message arrives, read it, and fetch the raw source. The report has 42 checks (SPF, DKIM, DMARC, 21 blocklists, two spam engines, Gmail and Yahoo bulk sender rules), each linked to its RFC, plus a fix plan. Remote endpoint, no API key.
Category & Scope

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": {
    "inbox-preview": {
      "command": "npx",
      "args": [
        "-y",
        "inbox-preview"
      ]
    }
  }
}

{
  "mcpServers": {
    "email-spam-tester": {
      "url": "https://email-spam-tester.com/mcp"
    }
  }
}

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