API Reference & Useful Endpoints

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


Email & DNS APIs

MXToolbox API

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

ZeroBounce API

  • API Docs
  • Email validation and scoring.

SendGrid API

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

Postmark API

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

DMARC Analyzer API

  • API Docs
  • DMARC reporting and analysis.

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!