Email API

Communication

Postmark

Transactional email delivery known for fast inbox delivery times and detailed analytics

Reported Latency

Typical performance from public reports -- not live measurements

Average: 95ms

p50

75ms

p95

200ms

p99

350ms

99.99%observed uptime

Free tier

100 emails/month

Paid starts at

$15/month (10,000 emails)

Authentication

API Key

Rate limit

Varies by plan

Protocols

REST

SDKs

Node.jsPythonRubyPHPJava.NET

Regions

USEU

Last updated: 2026-04-12