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API Reference & Useful Endpoints

This page lists common APIs and endpoints to help automate, validate, and monitor email and DNS workflows.

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Email & DNS APIs

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MXToolbox API

  • API Docs
  • Use for DNS lookups, blacklist checks, and SMTP diagnostics.

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ZeroBounce API

  • API Docs
  • Email validation and scoring.

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SendGrid API

  • API Docs
  • Transactional email sending, analytics, and deliverability monitoring.

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Postmark API

  • API Docs
  • Transactional email, inbound processing, and delivery analytics.

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DMARC Analyzer API

  • API Docs
  • DMARC reporting and analysis.

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Example: DNS Lookup (MXToolbox)

GET https://api.mxtoolbox.com/api/v1/lookup/mx/example.com
Headers: { "Authorization": "Bearer YOUR_API_KEY" }
Have a favorite API to suggest? Contact us or see our contributing guide!