MailFlat vs Mektup

In-depth architectural comparison of the MailFlat and Mektup 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?

M

Choose MailFlat 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 MailFlat Details

Choose Mektup 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 Mektup Details

Feature & Specification Comparison

Specification	M MailFlat Communication	Mektup Communication
Summary	Real email inboxes for AI agents: open an address, read the one-time code, send mail.	Self-hosted multi-domain email as MCP tools - register domains, real mailboxes, send/read mail.
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": {
    "mailflat": {
      "command": "uvx",
      "args": [
        "mailflat-mcp"
      ]
    }
  }
}

{
  "mcpServers": {
    "mektup": {
      "url": "https://usemektup.com"
    }
  }
}

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