Postmark vs Mailjet: Which is Better in 2026?
Choosing between Postmark and Mailjet 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:
- • You need email features specifically
- • 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
Mailjet
Email marketing and transactional email
Best for you if:
- • You need email marketing features specifically
- • Mailjet is an email delivery platform for transactional and marketing emails
- • It provides email API, campaign builder, and real-time analytics
| At a Glance |  Postmark |  Mailjet |
|---|---|---|
Starts at | FreeFree tier available | FreeFree tier available |
Best For | Email Marketing | |
Rating | 4.5/5 | 4.1/5 |
Choose Postmark or Mailjet?
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)
- Your work is email-shaped, not email marketing-shaped
Choose Mailjet if
Email marketing and transactional email
- Good email delivery
- Fair pricing
- Good API
- Your work is email marketing-shaped, not email-shaped
| Feature | Postmark | Mailjet |
|---|---|---|
| Pricing Model | Freemium | Freemium |
| User Rating | ★4.5/5 128 reviews | ★4.1/5 621 reviews |
| Categories | EmailAPI Tools | Email MarketingTransactional Email |
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
Mailjet
Email marketing and transactional email
Strengths
- +Good email delivery
- +Fair pricing
- +Good API
- +Email editor
- +EU-based
Weaknesses
- -Support varies
- -UI could improve
- -Limited automation
- -Better alternatives exist
- -Deliverability varies
Key features
Pricing: Postmark vs Mailjet
| Plan | Postmark | Mailjet |
|---|---|---|
| Tier 1 | Free Free | Free Free |
| Tier 2 | $15 Basic | $17 month Essential |
| Tier 3 | $16.5 Pro | N/A |
| Tier 4 | $18 Platform | N/A |
Pricing verified from each vendor's public pricing page. Compare in detail on Postmark pricing and Mailjet 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). Mailjet: 4.1/5 (621 reviews).
Go with: Postmark
Value user reviews?
Postmark: 128 reviews (4.5/5). Mailjet: 621 reviews (4.1/5).
Go with: Mailjet
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?
Postmark is a email tool. Mailjet is in email marketing. Pick the category that matches your needs.
How important are ratings?
Postmark is rated higher: 4.5/5 vs 4.1/5.
Key Takeaways
Postmark
- Higher user rating: 4.5/5 vs 4.1/5
- Free tier available
- Our pick for this comparison
Mailjet
- Larger review base (621 reviews)
- Better fit for email marketing
The Bottom Line
Postmark is our pick.
Frequently Asked Questions
Is Postmark or Mailjet better?
Postmark is rated in our evaluation. Both are freemium.
What are Postmark and Mailjet used for?
Postmark: Reliable, fast transactional email delivery for developers. Mailjet: Email marketing and transactional email.
What does Postmark cost vs Mailjet?
Postmark is freemium (free tier + paid plans). Mailjet is freemium (free tier + paid plans). Visit their websites for detailed pricing.