Postmark vs Mailgun
Comparing pricing tiers, deliverability architectures, and feature support for transactional and marketing senders.
Editorial Verdict
Both are developer-grade platforms, but they optimize different jobs: Postmark for best-in-class transactional delivery transparency (45-day logs, strict stream separation), Mailgun for API breadth — inbound parsing, email validation, and marketing sends from one account. Postmark starts cheaper ($15/mo incl 10k vs Mailgun’s $35 Foundation incl 50k); Mailgun wins on feature surface and high-volume rates.
Cost Benchmark Across Typical Workloads
Starter SaaS 10,000 emails/mo (95% tx)
Postmark $15.00/mo
vs
Mailgun $35.17/mo
Active Product 75,000 emails/mo (80% tx)
Postmark $77.40/mo
vs
Mailgun $85.24/mo
Scale Broadcast 500,000 emails/mo (50% tx)
Postmark $364.94/mo
vs
Mailgun $214.93/mo
Detailed Architectural Comparison
Postmark
Visit Postmark →Key Strengths
- Industry-leading delivery-time transparency and status page
- 45-day message retention (Mailgun logs are shorter on base plans)
- Lower entry cost: $15/mo incl 10k vs $35/mo Foundation
- Opinionated transactional defaults — less tuning required
Trade-offs & Gotchas
- No inbound-parse or validation product — separate tooling needed
- Premium pricing at scale ($0.35/1k even past 1M emails)
Mailgun
Visit Mailgun →Key Strengths
- Inbound routing + MIME parse webhooks Postmark lacks at this depth
- Email address validation API in the same account
- Marketing-capable streams on shared infrastructure
- Cheaper high-volume rates ($0.18/1k past 250k vs Postmark’s $0.35)
Trade-offs & Gotchas
- $35/mo floor makes it overkill for small transactional apps
- Shared pools on Foundation can show reputation variance
Feature Matrix Comparison
| Feature Capability | Postmark | Mailgun |
|---|---|---|
| Webhooks Event Dispatch | ✓ Included | ✓ Included |
| React Email / Modern SDKs | ✓ Native Support | ✓ Native Support |
| Inbound Email Routing / Parsing | ✓ Supported | ✓ Supported |
| Visual Drag & Drop Template Builder | ✓ Included | ✓ Included |
| Standard SMTP Relay | ✓ Supported | ✓ Supported |
| Sub-account / Multi-tenant Hierarchy | ✓ Supported | ✓ Supported |
| Activity & Search Retention | 45 Days | 30 Days |
| Dedicated IP Monthly Fee | $50/mo | $34.95/mo |
| EU Sovereign Data Residency (GDPR) | US Cloud | US Cloud |
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