domain_check_email_security
Check SPF, DMARC, and DKIM email authentication for a domain. domain: Domain without protocol e.g. "google.com". Returns: overall_grade (A–F), spf_score, dmarc_score, dkim_score (each 0–10), spf_record, dmarc_record, dkim_selectors_found. Scores reflect live DNS via Cloudflare DoH — no cache. SPF...
This record as markdown: /tools/dev-7bd0-mcp-server/domain-check-email-security.md
What domain_check_email_security does on DataNexus MCP
AI agents call domain_check_email_security to retrieve information from DataNexus MCP without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
domain | string | — | Domain without protocol e.g. google.com. Required. |
Parameters from the server's own tool schema.
Why domain_check_email_security is rated Low
This is a passive reconnaissance tool that queries public DNS information about a domain's email security posture. It retrieves and analyzes existing records without creating, modifying, or deleting any data. The function performs DNS lookups and scoring calculations on read-only public infrastructure.
From the tool's definition Tool queries DNS records via Cloudflare DoH to retrieve email authentication configurations (SPF, DMARC, DKIM). Returns read-only data: grades, scores, and record contents. No modifications, deletions, or side effects.
Attacks that exploit this kind of access
The rule that runs domain_check_email_security safely
PolicyLayer is an MCP gateway: it sits between your AI agents and DataNexus MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For domain_check_email_security, this is the rule to start with:
domain_check_email_security is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect DataNexus MCP, apply this rule, and every domain_check_email_security call is checked against it from then on.
Questions about domain_check_email_security
Check SPF, DMARC, and DKIM email authentication for a domain. domain: Domain without protocol e.g. "google.com". Returns: overall_grade (A–F), spf_score, dmarc_score, dkim_score (each 0–10), spf_record, dmarc_record, dkim_selectors_found. Scores reflect live DNS via Cloudflare DoH — no cache. SPF: -all=10 (strict), ~all=7, ?all=4, none=2, +all=0 (open relay). DMARC: p=reject=10, p=quarantine=7, p=none=4, absent=0; +1 for rua set. DKIM: selector found=10, none=0. Checks 10 common selectors in parallel. Example: check_email_security(domain="google.com"). It is categorised as a Read tool in the DataNexus MCP MCP Server, which means it retrieves data without modifying state.
domain_check_email_security accepts 1 parameter: domain. The full parameter table on this page comes from the server's own tool schema.
Register the DataNexus MCP server in PolicyLayer and add a rule for domain_check_email_security: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches DataNexus MCP. Nothing to install.
domain_check_email_security is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the domain_check_email_security rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for domain_check_email_security. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
domain_check_email_security is provided by the DataNexus MCP server (dev-7bd0/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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