ARC Relay vs Abnormal Security MCP

In-depth architectural comparison of the ARC Relay and Abnormal Security MCP 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?

A

Choose ARC Relay 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 ARC Relay Details

Choose Abnormal Security 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 Abnormal Security MCP Details

Feature & Specification Comparison

Specification	A ARC Relay Communication	Abnormal Security MCP Communication
Summary	DMARC-safe email forwarding for agents: aliases, DNS health checks, and MCP tools on your domains.	Abnormal Security email threats, cases, and reporting in your terminal and your AI agents.
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": {
    "arc-relay": {
      "command": "npx",
      "args": [
        "-y",
        "arc-relay"
      ]
    }
  }
}

{
  "mcpServers": {
    "abnormal-security-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "skills"
      ]
    }
  }
}

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