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"Information about headers" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Domain checks: SPF, DKIM, DMARC, BIMI, MTA-STS, SSL/TLS and HTTP security headers.
Email deliverability checks: SPF, DKIM, DMARC, BIMI, MTA-STS, blacklists, headers, spam words
IMF header unfold count, input discarded
Send transactional email over a verified domain — templates, attachments, custom headers.