Postmark vs Mailgun: Head-to-Head Comparison

Quick Verdict

Postmark is the better pick for apps where transactional deliverability is critical. Mailgun is the better pick for developers needing flexible sending and email validation.

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At a Glance

Feature	Postmark	Mailgun
Best For	Apps where transactional deliverability is critical	Developers needing flexible sending and email validation
Pricing	Free tier with paid plans	Free tier with paid plans
Free to Start	Yes	Yes
License	Proprietary	Proprietary
Deployment	Managed cloud	Managed cloud
Link	Visit Postmark	Visit Mailgun

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Detailed Breakdown

Postmark

Transactional email focused on deliverability

Pros:

• Excellent deliverability
• Separate message streams
• Great documentation

Cons:

• Higher price per email
• Limited marketing features

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Mailgun

Email API service by Sinch

Pros:

• Powerful routing and inbound parsing
• Email validation API
• Detailed logs

Cons:

• Free tier is limited
• Plan tiers can be confusing

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Key Differences

• Positioning: Postmark — transactional email focused on deliverability. Mailgun — email API service by Sinch.
• Both share the same licensing model (proprietary), so the decision comes down to features and workflow fit.
• Pricing: Postmark — free tier with paid plans. Mailgun — free tier with paid plans.
• Signature strength: Postmark — excellent deliverability. Mailgun — powerful routing and inbound parsing.

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Frequently Asked Questions

Is Postmark better than Mailgun?

It depends on your requirements. Postmark is a strong fit for apps where transactional deliverability is critical, while Mailgun suits developers needing flexible sending and email validation.

Is Postmark free to use?

Yes, you can start with Postmark for free. Pricing model: Free tier with paid plans.

Is Mailgun free to use?

Yes, you can start with Mailgun for free. Pricing model: Free tier with paid plans.

Can I self-host Postmark or Mailgun?

Postmark is offered as a managed service: managed cloud. Mailgun is offered as a managed service: managed cloud.

What are the main drawbacks of Postmark and Mailgun?

Postmark: higher price per email; limited marketing features. Mailgun: free tier is limited; plan tiers can be confusing.