Postmark vs Mailgun: Which is Better in 2026?
Choosing between Postmark and Mailgun comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Postmark
Reliable, fast transactional email delivery for developers
Best for you if:
- • Transactional email service with sub-second delivery and strict sender vetting since 2010
- • Separates transactional and promotional email into distinct streams to protect inbox placement
Mailgun
Send, parse, and validate emails with a reliable developer API
Best for you if:
- • Mailgun is an email API service for developers sending transactional email
- • It handles email delivery, validation, and tracking at scale
| At a Glance |  Postmark |  Mailgun |
|---|---|---|
Starts at | FreeFree tier available | FreeFree tier available |
Best For | ||
Rating | 4.5/5 | 4.2/5 |
Choose Postmark or Mailgun?
Choose Postmark if
Reliable, fast transactional email delivery for developers
- Sub-second delivery times significantly faster than most competitors
- Message streams separate transactional from promotional to protect deliverability
- Premium support included on all plans at no extra cost
- Budget matters (Free vs Free)
Choose Mailgun if
Send, parse, and validate emails with a reliable developer API
- Powerful API
- Email validation
- Good logs
| Feature | Postmark | Mailgun |
|---|---|---|
| Pricing Model | Freemium | Freemium |
| User Rating | ★4.5/5 128 reviews | ★4.2/5 518 reviews |
| Categories | EmailAPI Tools | EmailDeveloper Tools |
In-Depth Analysis
Postmark
Reliable, fast transactional email delivery for developers
Strengths
- +Sub-second delivery times significantly faster than most competitors
- +Message streams separate transactional from promotional to protect deliverability
- +Premium support included on all plans at no extra cost
- +Generous free tier with 100 emails per month that never expires
- +Clean developer-focused API with SDKs for all major languages
Weaknesses
- -Not designed for marketing or newsletter campaigns
- -Dedicated IPs require minimum 300,000 emails per month
- -Free plan limited to 100 emails which is very low for production use
- -Overage pricing can add up quickly at scale without pre-purchasing volume
- -No built-in drag-and-drop email builder for non-technical users
Key features
Mailgun
Send, parse, and validate emails with a reliable developer API
Strengths
- +Powerful API
- +Email validation
- +Good logs
Weaknesses
- -Complex pricing
- -Support can be slow
Key features
Pricing: Postmark vs Mailgun
| Plan | Postmark | Mailgun |
|---|---|---|
| Tier 1 | Free Free | Free Free |
| Tier 2 | $15 Basic | $35 Foundation |
| Tier 3 | $16.5 Pro | $90 Scale |
| Tier 4 | $18 Platform | Custom Enterprise |
Pricing verified from each vendor's public pricing page. Compare in detail on Postmark pricing and Mailgun pricing.
Who Should Use What?
On a budget?
Both are freemium. Compare plans on their websites.
Go with: Postmark
Want the highest-rated option?
Postmark: 4.5/5 (128 reviews). Mailgun: 4.2/5 (518 reviews).
Go with: Postmark
Value user reviews?
Postmark: 128 reviews (4.5/5). Mailgun: 518 reviews (4.2/5).
Go with: Mailgun
3 Questions to Help You Decide
What's your budget?
Both are freemium. Pricing won't help you decide here.
What's your use case?
Both are email tools. Compare their specific features to decide.
How important are ratings?
Postmark is rated higher: 4.5/5 vs 4.2/5.
Key Takeaways
Postmark
- Higher user rating: 4.5/5 vs 4.2/5
- Free tier available
- Our pick for this comparison
Mailgun
- Larger review base (518 reviews)
The Bottom Line
Postmark is our pick.
Frequently Asked Questions
Is Postmark or Mailgun better?
Postmark is rated in our evaluation. Both are freemium.
What are Postmark and Mailgun used for?
Postmark: Reliable, fast transactional email delivery for developers. Mailgun: Send, parse, and validate emails with a reliable developer API.
What does Postmark cost vs Mailgun?
Postmark is freemium (free tier + paid plans). Mailgun is freemium (free tier + paid plans). Visit their websites for detailed pricing.