MCP MeasureMCP Measure

index observed

DMARC Shark — Email DNS Checker

Check a domain's public SPF, DMARC, MX and DKIM DNS records on demand. No account required.

Should I use this

Quality & Safety

A
Description quality
100%
Schema completeness
80%
Naming quality
100%
Poisoning risk
100%
Permission match
100%
Protocol compliance
100%

Based on automated analysis of tool definitions and protocol compliance.

Context Cost

~399Tokens (tool definitions)
~1.5 KBTypical response size
Minimal attention impact (0.31% of 128k context)

This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.

Install

One-Click Install

Add this to your `claude_desktop_config.json` file:

{
  "mcpServers": {
    "email-dns-checker": {
      "url": "https://dmarcshark.com/mcp"
    }
  }
}

Remote endpoints

https://dmarcshark.com/mcpstreamable-http

What it can do

Tool inventory

Tools (2)

🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢check_domain(domain, selectors)

Runs fresh, bounded public SPF, DMARC, MX and optionally specified DKIM-selector DNS checks. Changes the public saved snapshot. Rate limited. DNS findings do not prove message authentication.

Input Schema

{
  "type": "object",
  "properties": {
    "domain": {
      "type": "string"
    },
    "selectors": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "maxItems": 2
    }
  },
  "required": [
    "domain"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

Output Schema

{
  "type": "object",
  "properties": {
    "domain": {
      "type": "string"
    },
    "checked_at": {
      "type": "string"
    },
    "source": {
      "type": "string"
    },
    "saved": {
      "type": "boolean"
    },
    "findings": {
      "type": "array"
    },
    "recommendations": {
      "type": "array"
    }
  },
  "required": [
    "domain",
    "checked_at",
    "source",
    "saved",
    "findings",
    "recommendations"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}
🟢get_saved_result(domain)

Reads the last saved, timestamped public snapshot without making any DNS queries. Results expire after 90 days.

Input Schema

{
  "type": "object",
  "properties": {
    "domain": {
      "type": "string"
    }
  },
  "required": [
    "domain"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

Output Schema

{
  "type": "object",
  "properties": {
    "domain": {
      "type": "string"
    },
    "checked_at": {
      "type": "string"
    },
    "source": {
      "type": "string"
    },
    "saved": {
      "type": "boolean"
    },
    "findings": {
      "type": "array"
    },
    "recommendations": {
      "type": "array"
    }
  },
  "required": [
    "domain",
    "checked_at",
    "source",
    "saved",
    "findings",
    "recommendations"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

Community

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Evidence

Recent observations

verifiedversion not recorded2 tools