Postmark API

Email · Operational · 30d uptime 100%
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Send transactional and marketing emails and get them to the inbox on time, every time. Postmark is a fast and reliable email delivery service for developers.

Trust signals

Pricing
PAID
Auth
API_KEY
CORS
No
Rate limit
250 sends/hour server limit default
Health
356ms
Trust score
90 (A)

Last checked Oct 16, 2026 · uptime 24h 100% / 7d 100% / 30d 100%

Excellent production-readiness signals.

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Integration checklist

  • Auth is API_KEY— no credit card required
  • No CORS — route calls through your backend.
  • Rate limit: 250 sends/hour server limit default
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