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"National Rail" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Check a domain's email DNS, whether Gmail and Outlook accept its mail, and its registration.
DMARC/SPF/DKIM/MX checks, email score, 100-domain bulk score, webhook watch alerts (x402 USDC).
Check DNS records and email authentication (SPF, DKIM, DMARC) for domains, as findings by severity