HEAD-TO-HEAD COMPARISON
Postmark vs Mailgun: Transactional Email & Deliverability APIs Compared
Comparing strict transactional-only deliverability leader Postmark against flexible inbound/outbound email routing engine Mailgun.
Live Head-to-Head Benchmark
Postmark vs Mailgun Speed & Payload Test
Execute both live public endpoints concurrently from your browser to compare latency, payload schema, and uptime readiness.
Postmark
GEThttps://postmarkapp.com/developer
Click "Run Side-by-Side Test" above to execute query
Mailgun
GEThttps://api.mailgun.net/v3/domains
Click "Run Side-by-Side Test" above to execute query
Technical Specifications Matrix
| Feature | Postmark | Mailgun |
|---|---|---|
| Authentication | Free Key Required | Free Key Required |
| Rate Limit (Free Tier) | 100 emails/month | 5000 emails/month |
| CORS & Security | HTTPS • CORS Ready | HTTPS • CORS Ready |
| Category | E-posta ve İletişim | E-posta ve İletişim |
| Official Website | Visit Docs | Visit Docs |
| FreeAPI Service Page | Postmark Page | Mailgun Page |
Key Engineering Takeaways & Differences
Postmark strictly separates promotional bulk mail from transactional streams, achieving industry-best inbox speed.
Mailgun excels at programmatic inbound email parsing, regex routing rules, and high-volume domain management.
Postmark provides 45 days of full message body and delivery event retention out of the box.
Mailgun offers versatile REST APIs for teams combining transactional alerts with bulk mailing lists.
Category Winner Recommendation
Time-to-Inbox SpeedPostmark
Inbound Email ParsingMailgun
Sender IP ReputationPostmark
High-Volume RoutingMailgun